---
product_id: 245602643
title: "MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 33.8 fl oz"
brand: "brightwell aquatics"
price: "11639 kr"
currency: ISK
in_stock: true
reviews_count: 8
url: https://www.desertcart.is/products/245602643-microbacter-start-xlf-concentrated-freshwater-nitrifying-bacteria-quick-start-fish
store_origin: IS
region: Iceland
---

# 15x concentrated power supports high-density tanks 5-7 day rapid cycling MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 33.8 fl oz

**Brand:** brightwell aquatics
**Price:** 11639 kr
**Availability:** ✅ In Stock

## Summary

> ⚡ Rapidly revitalize your aquarium’s ecosystem and never miss a beat!

## Quick Answers

- **What is this?** MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 33.8 fl oz by brightwell aquatics
- **How much does it cost?** 11639 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/245602643-microbacter-start-xlf-concentrated-freshwater-nitrifying-bacteria-quick-start-fish)

## Best For

- brightwell aquatics enthusiasts

## Why This Product

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

## Key Features

- • **Crowded Tank Champion:** Scientifically designed to reduce ammonia and nitrite in densely populated freshwater setups.
- • **Fast-Track Water Balance:** Achieve stable nitrification in just 5-7 days—perfect when time is of the essence.
- • **Turbocharge Your Tank Start:** Super concentrated 15x formula accelerates biological filtration for a thriving aquarium.
- • **Post-Cleaning Recovery Boost:** Speeds up bacteria re-establishment after tank maintenance or medication use for healthier fish.
- • **Proudly American-Made Quality:** Backed by science and crafted in the USA to ensure premium aquatic care you can trust.

## Overview

Brightwell Aquatics MicroBacter Start XLF is a 33.8 fl oz concentrated freshwater nitrifying bacteria solution that jumpstarts biological filtration in new and established tanks. Its 15x strength formula accelerates tank cycling within 5-7 days, effectively reducing ammonia and nitrite levels, especially in high-density aquariums. Safe for shrimp and compatible with various substrates, it supports rapid recovery post-cleaning or medication use. Made in the USA, it offers long shelf life and scientifically backed quality for optimal aquarium health.

## Description

Brightwell Aquatics MicroBacter Start XLF Experience a new level of aquarium care with Brightwell Aquatics MicroBacter Start XLF – the ultimate solution for achieving a balanced and thriving aquatic environment. Our concentrated formula is designed to boost the nitrogen cycle in your aquarium, ensuring the rapid establishment of biological filtration and creating a stable habitat for your aquatic companions. It’s particularly useful for new startups, resulting in tank cycling in 5 to 7 days in most cases. This shrimp safe advanced blend works effectively to break down organic waste, keeping your aquarium water pristine. It is meticulously formulated to enhance water quality and eliminate ammonia and nitrite spikes. Whether you're setting up a new tank or maintaining an established one, MicroBacter Start XLF is your go-to solution. Its versatility extends to fish and invertebrate freshwater aquariums and is particularly effective for live planted aquariums, providing powerful support for a diverse range of aquatic environments. FEATURES AT A GLANCE Super concentrated 15x strength formula Useful for rapidly re-establishing nitrification bacteria in case of an emergency Usually cycles in 5-7 days Ideal in aquaria with high population densities and when adding new fish Best used post-cleaning of rocks and surfaces or after use of medication Prevents “New Tank Syndrome” Supplied in a proprietary base for maximum longevity Formulated utilizing extensive data compiled by microbiologists AMERICAN-MADE EXCELLENCE Trust in the quality and excellence of Brightwell Aquatics, an industry-leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we consistently strive to deliver advanced superior quality solutions to elevate the vibrancy and health of your aquarium.

## Features

- HIGH-POWER TANK STARTER – MicroBacter Start XLF is a powerful 15x concentrated blend designed to kickstart biological filtration in new tanks and existing freshwater aquariums. It enhances water quality, providing a flourishing underwater environment with live, non-pathogenic microbes
- RAPID WATER CYCLING – Optimize your aquarium’s health swiftly with this shrimp safe fast-acting solution. Quickly accelerate the tank's beneficial nitrifying bacteria population for balance and stability in just 5-7 days. It’s the ideal solution when time is crucial
- FOR HIGH-DENSITY AQUARIUMS – A scientifically blended formula that caters to crowded tanks and effectively reduces ammonia and nitrite levels, all while supporting population density. Supplied in a proprietary base, providing maximum longevity in shipping and in your aquatic ecosystem. It has a shelf life of over a year at room temperature.
- ADVANCED TANK RECOVERY – Perfect for all levels of aquarium enthusiasts and compatible with various sand and rock substrates. Best used post-cleaning or after use of medications. This ammonia remover accelerates the re-establishment rate of fish tank bacteria, ensuring your fish thrive
- AMERICAN-MADE EXCELLENCE – Brightwell Aquatics is an industry-leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we consistently deliver advanced superior quality solutions to elevate the vibrancy and health of your aquarium

## Product Details

- **Brand:** Brightwell Aquatics
- **Liquid Volume:** 1 Liters
- **Item Weight:** 1.11 Kilograms
- **Item Form:** Liquid
- **Manufacturer:** Brightwell Aquatics

## Images

![MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 33.8 fl oz - Image 1](https://m.media-amazon.com/images/I/71dD74US-oL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Multi-purpose
*by Z***Z on June 27, 2024*

I got it to do two things: Keep the water clear in my pond, and help make liquid fertilizer. If you didn't know, you can put grass clippings and other organic stuff into water, and the water will leach out a lot of the good stuff. Eventually this progresses into a fermentation, and finally, nitrization. That's when bacteria start really turning the nitrogen in the liquid into something plants can use.Well, my liquid fertilizer mixture is still sitting, but not long after I added some of this, the water turned black. This is a good sign and shows that everything's working, and quickly! As for my pond, it looks great and has no problems.I recommend this item to people getting into homesteading, aquaculture, regenerative agriculture, making their own fertilizer, etc.

### ⭐⭐⭐⭐⭐ Works just like it’s says (I’ll definitely be buying again)
*by B***O on July 13, 2021*

The media could not be loaded. At first I was hesitant but I decided to buy this product to help cycle my 37 gallon goldfish aquarium but I’m glad I did. I had been trying to cycle my aquarium for a little over a month at that time but the ammonia just was converting, and the bacteria starters at my local Petco weren’t helping at all. I bought this along with a Aqua Clear 50 for extra filtration and set everything up. The following weeks after the bottle ran out (it lasted a week) my ammonia started converting and I added 5, 6 week old ranch’s goldfish inside. Now they’re all healthy and happy and algae’s even starting to take over on my glass. Overall this is a great product and when I get another aquarium I’ll definitely buy this for cycling.

### ⭐⭐⭐⭐⭐ Good stuff worth the money
*by K***N on September 25, 2025*

Absolute best way to start your tropical fish tank and have a perfect environment for fish survival. This stuff is a must and it works well.

## Frequently Bought Together

- Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 33.8 fl oz
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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-12*