---
product_id: 5650268
title: "API FIX"
brand: "api"
price: "4375 kr"
currency: ISK
in_stock: null
reviews_count: 9
category: "Api"
url: https://www.desertcart.is/products/5650268-api-fix
store_origin: IS
region: Iceland
---

# fish & plant safe formula 16 oz precision dosing fast-acting algae control API FIX

**Brand:** api
**Price:** 4375 kr
**Availability:** ❌ Out of Stock

## Summary

> 🌿 Clear water, happy fish, zero algae — your aquarium’s glow-up starts here!

## Quick Answers

- **What is this?** API FIX by api
- **How much does it cost?** 4375 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/5650268-api-fix)

## Best For

- api enthusiasts

## Why This Product

- Trusted api brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid Algae Knockdown:** See visible results fast on green water blooms and stubborn string algae.
- • **Aquarium-Friendly Formula:** Safe for fish and plants when used as directed—maintain a thriving ecosystem.
- • **Maintenance Made Effortless:** Switch to weekly dosing after control to keep your tank pristine with minimal effort.
- • **Trusted by Experts for 50+ Years:** Backed by API’s research-driven innovation, join thousands who trust Algaefix.
- • **Precision Dosing for Perfect Clarity:** Add just 1 ml per 10 gallons for targeted algae elimination without waste.

## Overview

API ALGAEFIX is a 16-ounce algae control solution designed to rapidly eliminate green water and string algae in freshwater aquariums. It offers a safe, fish- and plant-friendly formula when dosed correctly (1 ml per 10 gallons every three days until controlled, then weekly maintenance). Trusted for over 50 years, it reduces aquarium maintenance by keeping glass, ornaments, and plants clean without harming aquatic life—though caution is advised around crustaceans and sensitive snails.

## Description

Treat and control algae growth and reduce your freshwater aquarium maintenance with API ALGAEFIX Algae Control Solution. This revolutionary product is specially developed to control many types of algae, including "green water" algal blooms and string or hair algae, and it will not harm fish or plants when used as directed. Weekly doses of API ALGAEFIX Algae Control Solution will control algae growth and reduce aquarium maintenance. To treat algae, add 1 ml per 10 gallons of water and repeat every three days until algae is controlled. Use this aquarium treatment weekly to keep freshwater aquariums clean and clear. API ALGAEFIX Algae Control Solution is not for use with freshwater crustaceans including shrimp, crabs and lobsters. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results.

Review: Use with CAUTION! ETA: 10/30/2014; ETA 1/5/2015 - I picked this stuff up after going through 3 algae blooms in my 10-gallon tank (including one really bad one, couldn't see two inches past it, and the other two being much more tame). Now, I've read MANY mixed reviews on this product before making my purchase, and I have one thing to say. This is basically Weed-B-Gone for aquatic environments. It's made to kill algae. It's safe for fish IF USED RESPONSIBLY. We've treated two tanks with this stuff: a 60 gallon, and 10 gallon. No fish died. The 60 gallon: heavily infested with algae, specifically the brown hair algae. Applied the recommended dose (1 tsp per 50 gallons, we did a full dose). In the tank live two Convict Ciclids, two loaches, two kissing gourami, one minnow, and one otocinclus catfish. The tank itself is very well established bacteria wise, and has an appropriate canister filter going with four sponges and bacteria media. The lights on it are low-light, with one low-light grower. NONE of the fish were affected in any way shape or form. The 10 gallon: houses my one Oranda goldfish, along with 7-8 trumpet snails. Previously had ghost shrimp in it, but took them out prior to treatment, then ended up dying from separate causes (put three in a bowl, two died, the rest were killed by the stress of my goldfish chasing them and trying to eat them, I don't plan on getting any more, lol). As I stated above, went through three algae blooms/cycles before I bought this, and has an AquaClear 30gal. filter going with two sponges and bacteria media. The light on this one is a 96wat four tube grow light. The light penetrates a solid inch into the gravel, it's intense. WHEN I DOSED MY 10 GALLON: bottle says 1ml/10 gallons. From what I'VE been personally taught from my boyfriend (his 60 gallon has been running for 10+ years with absolutely no problems), the more gravel that is in the tank, less water; resulting in a smaller dose. I put HALF of 1 ML in the tank. My goldfish is UNAFFECTED, and my snails are as happy as could be cruising around. After repeated dosages, and even one dose being a full dose, my fish is fine. And now after about two weeks, I've seen NO new algae growth, AT ALL. I'm going to continue treating the tank, as it is planted and the algae has taken a liking to the plants, but as far as I can say, nothing has perished in my tank using this product, other than algae. With more heavily infested tanks: from the 60 gallon, it's petrifying to watch. When you treat it, the water will cloud up almost IMMEDIATELY. And it is and was scary to see it happen so fast. It was back to normal clarity overnight. Further research into this also relieved that the chemical diminishes in 24 hours, being completely gone by 48 hours. Example: I haven't changed the water in my 10 gallon since I've started using it. By the amount of chemical I've put in, I'm positive my fish would've been long gone by now. But he's still in perfect shape and health. Everything being said: use this with CAUTION! This is not a magical algae fix (well, was for us....), this is made to kill algae, and I'm sure with inappropriate usage, will kill a lot more than algae, including what is printed on the label. When you put this in your tank, the amount used is VERY important. Algae is still a living plant, living plants produce oxygen, if you have enough algae and do a large enough dose of this stuff it will have such an immediate impact that you will BASICALLY suffocate all of your fish. If you have any doubts about getting this product, find something else. And if you get it, use your brain. It's easy to over-dose, and some things just don't work with some people. In my case, I began with a half dose, because my tank is one of the fairly smaller ones, and I wanted to see just how my fish reacted to it. I gave it a day, then repeated the half dose, waited, continued with a full dose over the course of a week and a half. It's not the products fault, as it's working BEAUTIFULLY for our own tanks and MANY others. ETA: After moving twice and unfortunately losing my entire colony of snails, I've finally got only my 10 gal up and running as a snail tank right now. (It did have a Beta in it, but he passed away.) It was having some problems with Algae, so I slapped some of this in it, with previous encounters working just fine I didn't have a second thought. When I had lost my Malaysian Trumpet snail colony, I searched high and low to get some more and restart. I did, but the Malaysians I have now are.... different from the other Malaysians I had preciously (these are longer, have a sharper pointed shell, and are overall lighter--my previous ones were darker, larger in width, and had a more blunt pointed shell)--my new Trumpets reacted to this product, and after monitoring them for about 20 minutes and quick reacting, was able to save most of them and get the Algaefix out of the water. I don't know if these snails are just a slightly different variety of Malaysian Trumpets (the physical appearance tells me they DEFIANTLY are, but I haven't researched deep enough to be sure) but they are EXTREMELY SENSITIVE to this, and WILL kill them. So if you have ANY kind of crustacean/snail, USE WITH CAUTION! I can safely say that if you have my first "variety" of MTS, they're cool with it, but this second colony threw me for a huge loop. ETA 1/5/2015 My 10 gal planted became heavily infested with pest snails that came with a Banana plant, and I can safely say, large doses of this promptly got rid of all of them. (One large initial dose with filter off, then two more large doses after that 2 ~ 3 days apart!)
Review: YES! This is some great stuff. NO DEAD FISH. Do a water change! - Ok so I have been battling some really nasty black algae for over a year. Otherwise my aquarium is spotless and the water is already crystal clear before I even bought this. The algae that I have is only on surfaces like rocks and so forth. Not in the water. I have been dosing with peroxide and that does help but this stuff is actually killing my algae. I have lost NO FISH and have used this stuff every 3 days for the past few weeks. I haven't even had to scrape my glass. The water is still spotless. Does not make it cloudy at all. I wanted to point out though that if you have a lot of algae and then you use this stuff then you absolutely MUST do a water change. I would do at least 50% or more. Why? Because when you kill algae the residue is toxic to your fish and so then they will die and you will blame this stuff when in reality it is your fault for not doing a water change. It is the dead algae that is killing your fish. Not this product. Same thing if you were to use peroxide. I can easily say that this works about 2-3 times better than peroxide which is really saying something since peroxide does kill most of it. This is some powerful stuff. I have fish fry and the whole bit. Nothing is dead. Also, it is important to say I have a planted tank and that all my plants are fine. Even my moss which is super sensitive to peroxide, but does fine with this stuff. If you have algae on your plants you will find that your plants will have some holes in the leaves. That is not this product killing your plants but rather the algae is dying and your plants have holes because of the algae was killing your plants. So trim your plants after you use this stuff to get rid of any leaves with holes and then your plants will bounce back. This stuff is expensive but you don't need much of it. And since it works better than anything else and is simple to use I guess it is worth it. Just follow the directions AND DO A WATER CHANGE. If you don't then your fish will probably die.

## Features

- Contains one (1) API ALGAEFIX Algae Control 16-Ounce Bottle
- Controls algae growth and keeps aquarium glass, ornaments and plants clean
- Fast-acting and effective on "green water" algae blooms, string or hair algae
- Will not harm fish and plants when used as directed
- Dose every three days until algae is under control then dose weekly

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B003SNDNQ4 |
| ASIN  | B003SNDNQ4 |
| Best Sellers Rank | #2,156 in Pet Supplies ( See Top 100 in Pet Supplies ) #8 in Aquarium Water Treatments |
| Brand Name | API |
| Color | Moon Glow |
| Country of Origin | United States |
| Customer Reviews | 4.2 4.2 out of 5 stars (14,969) |
| Date First Available | September 21, 2007 |
| Date First Available  | September 21, 2007 |
| Department | Conditioners & Additives |
| Department  | Conditioners & Additives |
| Directions | It is a violation of federal law to use this product in a manner inconsistent with its labeling. Do not overdose. Add 1 ml for each 10 gallons (38 L) or 5 ml for each 50 gallons (190 L) of water. Repeat dose every three days until algae is controlled. Siphon or scrape any dead algae from aquarium. Once algae growth is under control, add one dose per week. Weekly doses will control algae growth and… |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 2 x 2 x 6 inches |
| Item Package Dimensions L x W x H | 9.13 x 2.48 x 2.44 inches |
| Item Weight | 0.2 Pounds |
| Item model number | 87E |
| Item model number  | 87E |
| Manufacturer | Mars Fishcare |
| Manufacturer  | Mars Fishcare |
| Manufacturer recommended age  | 1 month and up |
| Material | Plastic |
| Model Name | ALGAEFIX 16 OZ |
| Number of Items | 1 |
| Product Dimensions  | 2 x 2 x 6 inches; 3.2 ounces |
| Size | 16-Ounce |
| Style | Freshwater |
| Target Audience Keyword | dogs, fish |

## Product Details

- **Brand:** API
- **Item Form:** Liquid
- **Item Weight:** 0.2 Pounds
- **Liquid Volume:** 16 Fluid Ounces
- **Manufacturer:** Mars Fishcare

## Images

![API FIX - Image 1](https://m.media-amazon.com/images/I/71InwYYJHPL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: can this be used in birdbaths to help with algae?**
A: It would probably hurt the birds skin or even kill them if the drank it. So, no, I wouldn't use it for that. I think algae in a bird bath is inevitable since they get so much sunlight. A good scrub once a week would be your best bet.

**Q: Will algaefix harm the silicone decorations in my tank? do i have to remove these decorations in order to use this product correctly?**
A: API Algaefix can be used with the silicone decorations within the aquarium without adverse effects.

**Q: Any one know if this will kill your bio filters?**
A: not sure on the bio filters, but it killed half our fish.

**Q: I have 6 gallon aqueon Ascent frameless tank. How many drops do you put in tank to control algae problem.**
A: Don't do it.  It killed every fish in my tank, I had to change out EVERYTHING and start from scratch.  New substrate, airstone, any decoration, all plants, I mean EVERYTHING.  This is cyanide

## Customer Reviews

### ⭐⭐⭐⭐⭐ Use with CAUTION! ETA: 10/30/2014; ETA 1/5/2015
*by S***N on May 15, 2013*

I picked this stuff up after going through 3 algae blooms in my 10-gallon tank (including one really bad one, couldn't see two inches past it, and the other two being much more tame). Now, I've read MANY mixed reviews on this product before making my purchase, and I have one thing to say. This is basically Weed-B-Gone for aquatic environments. It's made to kill algae. It's safe for fish IF USED RESPONSIBLY. We've treated two tanks with this stuff: a 60 gallon, and 10 gallon. No fish died. The 60 gallon: heavily infested with algae, specifically the brown hair algae. Applied the recommended dose (1 tsp per 50 gallons, we did a full dose). In the tank live two Convict Ciclids, two loaches, two kissing gourami, one minnow, and one otocinclus catfish. The tank itself is very well established bacteria wise, and has an appropriate canister filter going with four sponges and bacteria media. The lights on it are low-light, with one low-light grower. NONE of the fish were affected in any way shape or form. The 10 gallon: houses my one Oranda goldfish, along with 7-8 trumpet snails. Previously had ghost shrimp in it, but took them out prior to treatment, then ended up dying from separate causes (put three in a bowl, two died, the rest were killed by the stress of my goldfish chasing them and trying to eat them, I don't plan on getting any more, lol). As I stated above, went through three algae blooms/cycles before I bought this, and has an AquaClear 30gal. filter going with two sponges and bacteria media. The light on this one is a 96wat four tube grow light. The light penetrates a solid inch into the gravel, it's intense. WHEN I DOSED MY 10 GALLON: bottle says 1ml/10 gallons. From what I'VE been personally taught from my boyfriend (his 60 gallon has been running for 10+ years with absolutely no problems), the more gravel that is in the tank, less water; resulting in a smaller dose. I put HALF of 1 ML in the tank. My goldfish is UNAFFECTED, and my snails are as happy as could be cruising around. After repeated dosages, and even one dose being a full dose, my fish is fine. And now after about two weeks, I've seen NO new algae growth, AT ALL. I'm going to continue treating the tank, as it is planted and the algae has taken a liking to the plants, but as far as I can say, nothing has perished in my tank using this product, other than algae. With more heavily infested tanks: from the 60 gallon, it's petrifying to watch. When you treat it, the water will cloud up almost IMMEDIATELY. And it is and was scary to see it happen so fast. It was back to normal clarity overnight. Further research into this also relieved that the chemical diminishes in 24 hours, being completely gone by 48 hours. Example: I haven't changed the water in my 10 gallon since I've started using it. By the amount of chemical I've put in, I'm positive my fish would've been long gone by now. But he's still in perfect shape and health. Everything being said: use this with CAUTION! This is not a magical algae fix (well, was for us....), this is made to kill algae, and I'm sure with inappropriate usage, will kill a lot more than algae, including what is printed on the label. When you put this in your tank, the amount used is VERY important. Algae is still a living plant, living plants produce oxygen, if you have enough algae and do a large enough dose of this stuff it will have such an immediate impact that you will BASICALLY suffocate all of your fish. If you have any doubts about getting this product, find something else. And if you get it, use your brain. It's easy to over-dose, and some things just don't work with some people. In my case, I began with a half dose, because my tank is one of the fairly smaller ones, and I wanted to see just how my fish reacted to it. I gave it a day, then repeated the half dose, waited, continued with a full dose over the course of a week and a half. It's not the products fault, as it's working BEAUTIFULLY for our own tanks and MANY others. ETA: After moving twice and unfortunately losing my entire colony of snails, I've finally got only my 10 gal up and running as a snail tank right now. (It did have a Beta in it, but he passed away.) It was having some problems with Algae, so I slapped some of this in it, with previous encounters working just fine I didn't have a second thought. When I had lost my Malaysian Trumpet snail colony, I searched high and low to get some more and restart. I did, but the Malaysians I have now are.... different from the other Malaysians I had preciously (these are longer, have a sharper pointed shell, and are overall lighter--my previous ones were darker, larger in width, and had a more blunt pointed shell)--my new Trumpets reacted to this product, and after monitoring them for about 20 minutes and quick reacting, was able to save most of them and get the Algaefix out of the water. I don't know if these snails are just a slightly different variety of Malaysian Trumpets (the physical appearance tells me they DEFIANTLY are, but I haven't researched deep enough to be sure) but they are EXTREMELY SENSITIVE to this, and WILL kill them. So if you have ANY kind of crustacean/snail, USE WITH CAUTION! I can safely say that if you have my first "variety" of MTS, they're cool with it, but this second colony threw me for a huge loop. ETA 1/5/2015 My 10 gal planted became heavily infested with pest snails that came with a Banana plant, and I can safely say, large doses of this promptly got rid of all of them. (One large initial dose with filter off, then two more large doses after that 2 ~ 3 days apart!)

### ⭐⭐⭐⭐⭐ YES! This is some great stuff. NO DEAD FISH. Do a water change!
*by K***W on March 12, 2025*

Ok so I have been battling some really nasty black algae for over a year. Otherwise my aquarium is spotless and the water is already crystal clear before I even bought this. The algae that I have is only on surfaces like rocks and so forth. Not in the water. I have been dosing with peroxide and that does help but this stuff is actually killing my algae. I have lost NO FISH and have used this stuff every 3 days for the past few weeks. I haven't even had to scrape my glass. The water is still spotless. Does not make it cloudy at all. I wanted to point out though that if you have a lot of algae and then you use this stuff then you absolutely MUST do a water change. I would do at least 50% or more. Why? Because when you kill algae the residue is toxic to your fish and so then they will die and you will blame this stuff when in reality it is your fault for not doing a water change. It is the dead algae that is killing your fish. Not this product. Same thing if you were to use peroxide. I can easily say that this works about 2-3 times better than peroxide which is really saying something since peroxide does kill most of it. This is some powerful stuff. I have fish fry and the whole bit. Nothing is dead. Also, it is important to say I have a planted tank and that all my plants are fine. Even my moss which is super sensitive to peroxide, but does fine with this stuff. If you have algae on your plants you will find that your plants will have some holes in the leaves. That is not this product killing your plants but rather the algae is dying and your plants have holes because of the algae was killing your plants. So trim your plants after you use this stuff to get rid of any leaves with holes and then your plants will bounce back. This stuff is expensive but you don't need much of it. And since it works better than anything else and is simple to use I guess it is worth it. Just follow the directions AND DO A WATER CHANGE. If you don't then your fish will probably die.

### ⭐⭐⭐⭐⭐ Effective and Easy-to-Use Algae Control
*by T***E on November 16, 2025*

API ALGAEFIX Algae Control is a reliable solution for keeping aquariums clear and algae-free. The 16-ounce bottle is easy to measure and apply, and it works quickly to control algae growth without harming fish or plants when used as directed. I’ve noticed a significant reduction in algae buildup after consistent use, and the water stays clean and healthy. The instructions are straightforward, making it simple for both beginners and experienced aquarium owners to use. Overall, this is a high-quality, effective product that helps maintain a beautiful and healthy tank.

## Frequently Bought Together

- API ALGAEFIX Algae Control 16-Ounce Bottle
- API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle
- API ACCU-CLEAR Freshwater Aquarium Water Clarifier 8-Ounce Bottle

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---

*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-21*