--- product_id: 329721442 title: "Brightwell Aquatics 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: "429 Lei" currency: RON in_stock: true reviews_count: 5 category: "Brightwell Aquatics" url: https://www.desertcart.ro/products/329721442-brightwell-aquatics-microbacter-start-xlm-concentrated-saltwater-nitrifying-bacteria-quick store_origin: RO region: Romania --- # 15x concentrated power supports high-density tanks cycles tank in 7 days Brightwell Aquatics 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:** 429 Lei **Availability:** ✅ In Stock ## Summary > 🐟 Dive into crystal-clear waters faster with MicroBacter Start XLM! ## Quick Answers - **What is this?** Brightwell Aquatics 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?** 429 Lei with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/329721442-brightwell-aquatics-microbacter-start-xlm-concentrated-saltwater-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 - • **Crowd-Ready Formula:** Effectively reduces ammonia and nitrite even in densely populated marine tanks. - • **Post-Care Powerhouse:** Accelerates bacterial recovery after cleaning or medication, ensuring your fish thrive without downtime. - • **Proudly American-Made Quality:** Scientifically formulated and manufactured in the USA for trusted, consistent aquarium health. - • **Fast-Track to Aquarium Stability:** Achieve balanced nitrogen cycling in just 7 days—because your aquatic ecosystem deserves speed. - • **Turbocharge Your Tank's Biofilter:** 15x concentrated formula jumpstarts nitrifying bacteria for rapid water clarity. ## Overview Brightwell Aquatics MicroBacter Start XLM is a 15x concentrated liquid bacterial supplement designed to rapidly establish and maintain biological filtration in saltwater aquariums. It accelerates nitrifying bacteria colonization to cycle tanks in as little as 7 days, reduces harmful ammonia and nitrite levels in high-density setups, and supports quick recovery post-cleaning or medication. Made in the USA, this scientifically backed formula ensures a stable, thriving marine environment for both new and established tanks. ## 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. Review: Keeps the tank in good shape Review: Followed all instructions (dry sand, Marco rock etc together with Rapid Cycle from Brightwell) but after four weeks NH3 was still 0.05ppm and Nitrate was only 5ppm. Tank has not cycled in 1 month let alone their claimed 7 days. Have now given up with Brightwell - added live sand and rock and Dr Tims. Hopefully this will work. ## 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 | #40,589 in Pet Supplies ( See Top 100 in Pet Supplies ) #343 in Fish Medication & Health Supplies | | Brand Name | Brightwell Aquatics | | Customer Reviews | 4.5 4.5 out of 5 stars (741) | | Global Trade Identification Number | 00810086019519 | | Included Components | MicroBacter-StartXLM | | Item Form | Liquid | | Item Type Name | Aquarium Bacteria | | Liquid Volume | 250 Milliliters | | Manufacturer | Brightwell Aquatics | | Target Species | Fish | | UPC | 810086019519 | | Unit Count | 1 Count | ## Product Details - **Brand:** Brightwell Aquatics - **Item form:** Liquid - **Liquid volume:** 250 Milliliters - **Manufacturer:** Brightwell Aquatics - **UPC:** 810086019519 ## Images ![Brightwell Aquatics 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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by L***S on 18 March 2026* Keeps the tank in good shape ### ⭐ Review *by D***. on 16 August 2022* Followed all instructions (dry sand, Marco rock etc together with Rapid Cycle from Brightwell) but after four weeks NH3 was still 0.05ppm and Nitrate was only 5ppm. Tank has not cycled in 1 month let alone their claimed 7 days. Have now given up with Brightwell - added live sand and rock and Dr Tims. Hopefully this will work. ### ⭐⭐⭐⭐⭐ Review *by M***W on 1 April 2026* This will always be my go-to from now on. Works like a charm ## Frequently Bought Together - Brightwell Aquatics MicroBacter Start XLM - Concentrated Saltwater Nitrifying Bacteria - Quick Start Fish Tank Starter, Lift Microbe Levels & Water Filtering - Marine Aquarium Treatments, 8.45 fl oz - Brightwell Aquatics MicroBacter7 Complete Bioculture for Fish Tank or Aquarium - Populates Biological Filter Media for Saltwater and Freshwater Fish - Aquarium Water Treatments, 16.9 fl oz - Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ro/products/329721442-brightwell-aquatics-microbacter-start-xlm-concentrated-saltwater-nitrifying-bacteria-quick](https://www.desertcart.ro/products/329721442-brightwell-aquatics-microbacter-start-xlm-concentrated-saltwater-nitrifying-bacteria-quick) --- *Product available on Desertcart Romania* *Store origin: RO* *Last updated: 2026-04-23*