---
product_id: 651038165
title: "Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz"
brand: "brightwell aquatics"
price: "117 kr"
currency: NOK
in_stock: false
reviews_count: 5
url: https://www.desertcart.no/products/651038165-brightwell-aquatics-microbacter-start-xlf-concentrated-freshwater-nitrifying-bacteria-quick
store_origin: NO
region: Norway
---

# All Life Stages 15x Concentrated 5-7 Days Cycling Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz

**Brand:** brightwell aquatics
**Price:** 117 kr
**Availability:** ❌ Out of Stock

## Summary

> 🌊 Dive into a thriving aquarium experience!

## Quick Answers

- **What is this?** Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz by brightwell aquatics
- **How much does it cost?** 117 kr with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/651038165-brightwell-aquatics-microbacter-start-xlf-concentrated-freshwater-nitrifying-bacteria-quick)

## 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

- • **Rapid Cycling Solution:** Achieve a balanced ecosystem in just 5-7 days!
- • **Kickstart Your Aquarium:** Transform your tank with a powerful 15x concentrated blend!
- • **Proudly Made in the USA:** Trust in American-made excellence for your aquatic needs!
- • **Advanced Recovery Formula:** Ideal for post-cleaning or medication recovery!
- • **Perfect for High-Density Tanks:** Effectively reduces ammonia and nitrite levels for thriving fish!

## Overview

Brightwell Aquatics MicroBacter Start XLF is a concentrated freshwater nitrifying bacteria solution designed to enhance biological filtration in aquariums. This fast-acting formula accelerates the growth of beneficial bacteria, ensuring optimal water quality and stability in just 5-7 days. Suitable for all life stages of fish and effective in high-density tanks, it is an essential product for both novice and experienced aquarium enthusiasts.

## 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Allergen Information | Sulphites Free |
| Asin | B086Z6DS4M |
| Best Sellers Rank | #60,101 in Pet Supplies (See Top 100 in Pet Supplies) |
| Brand Name | Brightwell Aquatics |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,198) 4.5 out of 5 stars |
| Included Components | MicroBacterStart XLF |
| Item Form | Liquid |
| Item Type Name | Water Conditioner |
| Item Weight | 540 g |
| Liquid Volume | 500 Milliliters |
| Manufacturer | Brightwell Aquatics |
| Manufacturer Part Number | BACSTARTXLF500 |
| Model Number | BACSTARTXLF500 |
| Number Of Items | 1 |
| Number Of Packs | 1 |
| Pet Type | Fish |
| Target Species | Fish |
| Unit Count | 1 Count |
| Upc | 810086019618 |

## Product Details

- **Brand:** Brightwell Aquatics
- **Liquid volume:** 500 Milliliters
- **Item weight:** 540 g
- **Item form:** Liquid
- **Manufacturer:** Brightwell Aquatics

## Images

![Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz - Image 1](https://m.media-amazon.com/images/I/71BHceVYGtL.jpg)
![Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz - Image 2](https://m.media-amazon.com/images/I/81ha0xDUH-L.jpg)
![Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz - Image 3](https://m.media-amazon.com/images/I/714qWjkq7uL.jpg)
![Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz - Image 4](https://m.media-amazon.com/images/I/81tF2dpddsL.jpg)
![Brightwell Aquatics MicroBacter Start XLF - Concentrated Freshwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Aquarium Water Treatments, 16.9 fl oz - Image 5](https://m.media-amazon.com/images/I/91j0HHxHI4L.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Toss the Fritz and buy THIS!!!
*by  on Reviewed in the United States 7 April 2026*

I have always used Fritz bacteria but once I tried this little bottle, there was no going back. I was emergency in cycling a tank and struggling so bad. Had gone through a ton of Fritz and many weeks, but one does of this and my parameters were moving in the right direction 24 hrs later and nearly cycled within 72 hrs. It’s a smaller bottle but the doses are smaller so don’t let that deter you. My tiny bottle has lasted me almost a year now and I just started cycling a new tank with it and have nitrite on day 3! I swear by it! Save yourself time, money and headache and just buy it!

### ⭐⭐⭐⭐⭐ 100 % recommend!!
*by  on Reviewed in the United States 5 December 2025*

Amazing product!! My tank was cycling for over a month and no changes, my ammonia 0ppm, nitrite super high and barely any nitrate, and I was using brightwell florin bacter 7 which is great as well but for some reason wasn’t working for this bigger tank. So I did some research and it said I could just substitute the florin Bacter for the micro bacter start XLF since they’re the same brand and are compatible (do your research) so I did and after 4 days dosing it my tank was ready and no nitrites at all!! It was like magic. I recommend this to start cycling the tank since it’s so strong and then continue after water changes with the Florin Bacter7 which is what I’m doing and it’s going great so far. Also keep both in the fridge.One think I must add is that for some reason I thought the bottle was going to be bigger because of the picture they display but it’s still enough because it’s concentrated and it’s only to use once in a while.I also use it when I have ammonia in my nano tank I dose it for 2-3 days and it boosts the nitrifying bacteria 🙌🏻 love it and will buy again and again.

### ⭐⭐⭐⭐⭐ Great bacteria booster for starting and supporting a cycle
*by  on Reviewed in the United States 17 February 2026*

I’ve had very good results using Brightwell Aquatics MicroBacter alongside cycled or seeded bio media. Using both together really helps fast track the cycling process instead of starting from zero.It’s easy to dose and has been especially helpful when setting up new tanks or reinforcing an existing cycle after changes. Pairing it with established media has made cycling much quicker and less stressful. I like keeping it on hand for both new setups and ongoing tank maintenance.

## 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, 16.9 fl oz
- Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml
- API FRESHWATER MASTER TEST KIT 800-Test Freshwater Aquarium Water Master Test Kit, White, Single, Multi-colored

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*Product available on Desertcart Norway*
*Store origin: NO*
*Last updated: 2026-10-25*