---
product_id: 446313975
title: "Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml"
brand: "brightwell aquatics"
price: "€ 160.96"
currency: EUR
in_stock: true
reviews_count: 5
category: "Brightwell Aquatics"
url: https://www.desertcart.sk/products/446313975-brightwell-aquatics-microbacterstart-xlf-concentrated-live-tank-starter-for-cycling
store_origin: SK
region: Slovakia
---

# 15X concentrated live microbes boosts nitrification rate cycles tank in 5-7 days Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml

**Brand:** brightwell aquatics
**Price:** € 160.96
**Availability:** ✅ In Stock

## Summary

> ⚡ Fast-track your aquarium’s health with microbial power!

## Quick Answers

- **What is this?** Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml by brightwell aquatics
- **How much does it cost?** € 160.96 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/446313975-brightwell-aquatics-microbacterstart-xlf-concentrated-live-tank-starter-for-cycling)

## 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

- • **High-Density Ready:** Perfect for heavily stocked tanks and new fish introductions without stress.
- • **Long-Lasting Potency:** Proprietary base ensures maximum microbial longevity and effectiveness.
- • **Beat New Tank Syndrome:** Rapidly reduces toxic ammonia and nitrites to protect your aquatic life.
- • **Emergency Bacteria Rescue:** Re-establish nitrifying bacteria quickly after cleaning or medication use.
- • **Turbocharge Your Tank Setup:** Concentrated 15X live bacteria suspension for lightning-fast biological filtration.

## Overview

Brightwell Aquatics MicroBacterStart XLF is a 500 ml concentrated liquid containing 15X live, non-pathogenic nitrifying bacteria designed to rapidly cycle new freshwater aquariums and restore biological filtration. It effectively reduces ammonia and nitrite levels within 5-7 days, prevents new tank syndrome, and supports high-density fish populations, making it essential for both new setups and emergency bacterial re-establishment.

## Description

Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml : desertcart.in: Pet Supplies

Review: This is the best quick start for bacteria that i have used. I’ve tried all the other brand names that everyone is aware of. My tank was cycled in a week. Will be my go to from now on.
Review: I was having a bit of a problem 'cycling' the 125-gallon tank with Seachem Stability. Ordered the Brightwell Aquatics MicroBacterStart XLF and, combined with Fluval's Biological Enhancer added on top of the Seachem Stability, the tank was completely cycled within 48 hours. Granted, the Seachem had the ammonia taken care of, but the nitrites were just not budging and would escalate rapidly without major water changes and additions of Seachem Prime daily. I am SOOO glad to have found the Brightwell product.

## Features

- Concentrated 15X Suspension of LIVE non-pathogenic microbes, specifically formulated to extremely rapidly establish biological filtration in new aquarium set-ups, and to enhance the rate of nitrification in existing systems.
- Useful for rapidly re-establishing nitrification bacteria in case of an emergency
- Particularly useful in aquaria with high population densities and when adding new fish. Supplied in a proprietary base which provides for maximum longevity.
- Helpful to re-establish nitrifying bacteria after cleaning rocks and surfaces and after use of medications. 1. Rapid reduction of ammonia, and nitrite. 2. Prevents “New Tank Syndrome.”
- Takes 5-7 days to cycle.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B086Z6DS4M |
| Brand | Brightwell Aquatics |
| Generic Name | Water Conditioner |
| Included Components | MicroBacterStart XLF |
| Item Form | Liquid |
| Item Weight | 540 g |
| Item model number | BACSTARTXLF500 |
| Liquid Volume | 500 Millilitres |
| Manufacturer | Brightwell Aquatics |
| Net Quantity | 1 Count |
| Package Dimensions | 19.7 x 6.3 x 5.9 cm; 539.77 g |
| UPC | 810086019618 |

## Product Details

- **Brand:** Brightwell Aquatics
- **Item Form:** Liquid
- **Item Weight:** 540 g
- **Liquid Volume:** 500 Millilitres
- **Manufacturer:** Brightwell Aquatics

## Images

![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml - Image 1](https://m.media-amazon.com/images/I/71BHceVYGtL.jpg)
![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml - Image 2](https://m.media-amazon.com/images/I/81ha0xDUH-L.jpg)
![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml - Image 3](https://m.media-amazon.com/images/I/714qWjkq7uL.jpg)
![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml - Image 4](https://m.media-amazon.com/images/I/81tF2dpddsL.jpg)
![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 500 ml - Image 5](https://m.media-amazon.com/images/I/91j0HHxHI4L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by C***L on 21 January 2026*

This is the best quick start for bacteria that i have used. I’ve tried all the other brand names that everyone is aware of. My tank was cycled in a week. Will be my go to from now on.

### ⭐⭐⭐⭐⭐ Review
*by C***S on 28 February 2024*

I was having a bit of a problem 'cycling' the 125-gallon tank with Seachem Stability. Ordered the Brightwell Aquatics MicroBacterStart XLF and, combined with Fluval's Biological Enhancer added on top of the Seachem Stability, the tank was completely cycled within 48 hours. Granted, the Seachem had the ammonia taken care of, but the nitrites were just not budging and would escalate rapidly without major water changes and additions of Seachem Prime daily. I am SOOO glad to have found the Brightwell product.

### ⭐⭐⭐⭐⭐ Review
*by S***Y on 21 April 2021*

Like most long time fish keepers, I've always been suspicious of any product advertised as nitrifying bacteria starter. I always assumed these products were a hoax. Recently, I've been struggling to get some of my new aquariums cycled and decided out of desperation to give some of these products a try! I had no luck with the usual pet store bacteria starters, but I saw a good review for this product online from a long time hobbyist and decided to give it a shot. I am truly blown away by the results! This product got a 10 gallon and a 20 gallon cycled in 7 days exactly, and in that time I never had an ammonia or nitrite spike and never had to change any water. I'm honestly amazed! If you're struggling with a new tank I would highly recommend this starter. I'm so glad I tried this product, and will definitely be using it religiously in the future!

## 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 Slovakia*
*Store origin: SK*
*Last updated: 2026-03-03*