---
product_id: 174277258
title: "MicroBacter Start XLM - Concentrated Saltwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Marine Aquarium Treatments, 8.45 fl oz"
brand: "brightwell aquatics"
price: "588 kr"
currency: NOK
in_stock: true
category: "Brightwell Aquatics"
url: https://www.desertcart.no/products/174277258-microbacter-start-xlm-concentrated-saltwater-nitrifying-bacteria-quick-start-fish
store_origin: NO
region: Norway
---

# 15x concentrated power scientifically formulated 7-day rapid cycling MicroBacter Start XLM - Concentrated Saltwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Marine Aquarium Treatments, 8.45 fl oz

**Brand:** brightwell aquatics
**Price:** 588 kr
**Availability:** ✅ In Stock

## Summary

> 🌊 Dive into crystal-clear waters faster with MicroBacter Start XLM!

## Quick Answers

- **What is this?** MicroBacter Start XLM - Concentrated Saltwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Marine Aquarium Treatments, 8.45 fl oz by brightwell aquatics
- **How much does it cost?** 588 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/174277258-microbacter-start-xlm-concentrated-saltwater-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

- • **Cycle in Just One Week:** Fast-acting bacteria colonization stabilizes water chemistry in only 7 days—no more waiting around.
- • **Proudly American-Made Quality:** Backed by science and crafted in the USA for reliable, premium aquarium care.
- • **Turbocharge Your Tank's Biofilter:** 15x concentrated formula jumpstarts nitrifying bacteria for a thriving marine ecosystem.
- • **Post-Cleaning & Medication Recovery:** Accelerates bacterial re-establishment after tank maintenance or treatments, ensuring fish stay healthy.
- • **Handle High-Density Aquariums with Ease:** Effectively reduces ammonia and nitrite even in crowded tanks, supporting vibrant aquatic life.

## Overview

Brightwell Aquatics MicroBacter Start XLM is a 15x concentrated, scientifically formulated liquid bacterial supplement designed to rapidly establish and restore nitrifying bacteria in saltwater aquariums. It accelerates the nitrogen cycle within 7 days, reduces harmful ammonia and nitrite levels, and supports high-density marine tanks. Ideal for new setups, post-cleaning recovery, and after medication use, this American-made product ensures a stable, healthy aquatic environment for thriving fish and coral.

## Description

Brightwell Aquatics MicroBacter Start XLM Discover the ultimate in aquarium care with Brightwell Aquatics MicroBacter Start XLM. This concentrated formula establishes or boosts the nitrogen cycle, rapidly setting up biological filtration and creating a stable habitat in as little as 7 days. Perfect for new tanks, emergencies, or post-medication recovery, it breaks down nitrogenous waste, enhancing water quality and eliminating ammonia and nitrite spikes. Ideal for both new and established tanks, MicroBacter Start XLM is versatile for marine and brackish aquariums, ensuring a thriving aquatic environment. FEATURES AT A GLANCE Super concentrated 15x strength formula Rapidly restores nitrification bacteria in emergencies Usually cycles in 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 WATER STARTER – MicroBacter Start XLM is a 15x concentrated blend to kickstart biological filtration in new and existing saltwater aquariums. It provides a flourishing underwater environment with live, non-pathogenic microbes
- RAPID WATER CYCLING – Optimize your aquarium’s health with this fast-acting supplement. Accelerate the tank's beneficial nitrifying bacteria colonization rates for balance and stability in just 7 days. It’s the ideal solution when time is crucial
- FOR HIGH-DENSITY AQUARIUMS – A scientifically blended formula that effectively reduces ammonia and nitrite levels in crowded tanks, all while supporting population density. Shelf stable for over a year at room temperature
- ADVANCED TANK RECOVERY – Perfect for aquarium enthusiasts and various sand and rock substrates. Best used post-cleaning or after use of medications. This solution accelerates the re-establishment rate of fish tank bacteria, ensuring your fish thrive
- AMERICAN-MADE EXCELLENCE – Brightwell Aquatics is a leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we deliver advanced solutions to elevate the vibrancy and health of your aquarium

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B082BWNQ37 |
| Allergen Information | Sulphites Free |
| Best Sellers Rank | #21,781 in Pet Supplies ( See Top 100 in Pet Supplies ) #178 in Aquarium Water Treatments |
| Brand | Brightwell Aquatics |
| Brand Name | Brightwell Aquatics |
| Customer Reviews | 4.5 out of 5 stars 869 Reviews |
| Global Trade Identification Number | 00810086019519 |
| Included Components | MicroBacter-StartXLM |
| Item Form | Liquid |
| Item Type Name | Aquarium Bacteria |
| Item Weight | 0.28 kg |
| Liquid Volume | 250 ml |
| Manufacturer | Brightwell Aquatics |
| Manufacturer Part Number | BACSTARTXLM250 |
| Model Number | BACSTARTXLM250 |
| Number of Items | 1 |
| Pet Type | Fish |
| Target Species | Fish |
| UPC | 810086019519 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Brightwell Aquatics
- **Item Form:** Liquid
- **Item Weight:** 0.28 kg
- **Liquid Volume:** 250 ml
- **Unit Count:** 1 Count

## Images

![MicroBacter Start XLM - Concentrated Saltwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Marine Aquarium Treatments, 8.45 fl oz - Image 1](https://m.media-amazon.com/images/I/71d7iK4cswL.jpg)

## Questions & Answers

**Q: Does this ship with ice packs? How is it insured the bacteria will be alive still after spending all day in a hot 100-110 F delivery truck?**
A: It does not ship with ice packs.  It is a much more stable product than older competing products.  It will typically stand hot delivery trucks for short periods of time and it will typically take a freeze and still be viable, if thawed slowly (never microwave).  Can it be killed in transit, yes, but it is not very likely.  If you ever have a problem, please contact us and we will make sure you are satisfied.  Thanks for the question.

**Q: Am i understanding this correctly, you can’t use this product with caribsea dry live rock starting a new tank from scratch?**
A: You can use it with dry rock that has been seeded with dry bacteria, but that bacteria is the wrong species to use at this stage of cycling and will prolong the cycle to a month or even longer.  MicroBacter Start XLM will still work, but not as efficiently because they will be fighting the other bacteria for nutrients and the different species can even consume each other.  You will be better off using real live rock, or Real Reef Rock (TM), rock from another aquarium or a store, bare rock from the land, marco rock or any rock to which dry bacteria has NOT been added.  Let XLM work alone and it will do its job wonderously, or use it with normal aquarium bacteria (as in rock kept in an aquarium).  If you use dry cysted bacteria, it will cause problems, but in the end you will still cycle (and it will be a good cycle, it will just take a prolonged time to cycle).  We just recommend against using other packaged or dry bacterial products at the same time.  If you have further questions, or need specific help, please fill out our web form or contact the factory, we will be happy to help.

**Q: Is there a way to use this if I have already put live sand in the tank?**
A: I use it all the time and my tank has live sand and live rocks. My tank is 3 years old and established.   I think it depends upon if your tank is new and on its first cycle or if it is an established tank and you are doing a water change, etc.  I believe a first time new tank is where the problem with live sand comes in.  Hope this helps.

**Q: Can i use this product when adding new fish to an stable reef tank?**
A: Yes. I am using this product for last 2 years. Every weekend I put to control on Algee grow problems. But I really don’t understand what’s the relation between adding new fish with this product? When we add new fish we not use KH, CA or MG liquids to maintain Aquarim parameters ? I think you got your answer with logic

## Frequently Bought Together

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*Product available on Desertcart Norway*
*Store origin: NO*
*Last updated: 2026-09-18*