--- product_id: 437869786 title: "Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 1 Liter" brand: "brightwell aquatics" price: "€ 355.98" currency: EUR in_stock: true url: https://www.desertcart.hr/products/437869786-brightwell-aquatics-microbacterstart-xlf-concentrated-live-tank-starter-for-cycling store_origin: HR region: Croatia --- # 15X concentrated live microbes 5-7 day rapid tank cycling emergency nitrification recovery Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 1 Liter **Brand:** brightwell aquatics **Price:** € 355.98 **Availability:** ✅ In Stock ## Summary > ⚡ Fast-track your freshwater aquarium’s health with MicroBacterStart XLF! ## Quick Answers - **What is this?** Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 1 Liter by brightwell aquatics - **How much does it cost?** € 355.98 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/437869786-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 - • **Emergency Ready:** Rapidly re-establish nitrifying bacteria after filter failures or medication use to protect your aquatic ecosystem. - • **Cycle in Record Time:** Achieve full nitrification in just 5-7 days and skip the dreaded New Tank Syndrome. - • **Max Longevity Formula:** Proprietary base ensures maximum bacterial viability and potency for long-lasting performance. - • **Turbocharge Your Tank Setup:** Concentrated 15X live bacteria suspension accelerates biological filtration like no other. - • **Stress-Free High-Density Aquariums:** Ideal for tanks with heavy fish populations or after cleaning, maintaining water quality effortlessly. ## Overview Brightwell Aquatics MicroBacterStart XLF is a 1-liter, highly concentrated live bacterial suspension designed to rapidly establish and maintain nitrifying bacteria in freshwater aquariums. It accelerates the cycling process to 5-7 days, prevents toxic ammonia and nitrite buildup, and is essential for emergency recovery of biological filtration, especially in high-density or newly set-up tanks. ## Description MicroBacterStart XLF 15X creates a nitrifying biological filter in freshwater aquaria of all types and is particularly useful for new startups, resulting in tank cycling in 5 to 7 days in most cases. It quickly removes toxic ammonia and nitrite naturally through nitrifying bacterial action. Even though this product is potent, it may be overdosed at up to 5 times rated dosage during aquarium upsets. It should be your first choice to remove ammonia during emergencies where the filter has been inadvertently killed. MicroBacterStart XLF 15 X is a highly concentrated, selective complex of live, extremely effective microbes and enzymes that rapidly reduces the concentrations of organic nitrogen, ammonia, and nitrite in freshwater ecosystems, leading to greatly improved water quality and much faster cycling. Use of MicroBacterStart XLF does not alleviate the requirement for regular partial water changes to help maintain proper concentrations of elements that are vital to long-term health and survival of aquarium inhabitants. Notes - It is normal for clumps to form in the product and for the product and the aquarium to have an “earthy” smell or smell “off” and for the aquarium water to become cloudy and the smell and cloudiness to remain for many hours after using. This is due to the bacteria themselves and is an indication of quality and is the reason it is necessary to Shake product well immediately before using. Brightwell recommends that you not use any other type of bacteria product until your cycle with this product is complete. There are no other bacteria species that will be compatible with this nitrifying bacteria product until the cycle is complete. To add other bacteria will significantly lengthen the time it takes to cycle. Storage: Although product can withstand elevated temperatures for short periods of time, for best longevity and highest potency, keep below 80 deg F and if possible, refrigerate at 50 degrees F. Do not freeze! Freezing can kill the bacteria. ## 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 | |---------------|-------| | Brand | Brightwell Aquatics | | Liquid Volume | 1 Litres | | Item Weight | 1.11 Kilograms | | Item Form | Liquid | | Manufacturer | Brightwell Aquatics | | UPC | 810086019625 | | Country of Origin | USA | | Item model number | BACSTARTXLF1L | | Package Dimensions | 23 x 8.8 x 7.7 cm; 1.11 kg | | ASIN | B086Z669LW | ## Product Details - **Brand:** Brightwell Aquatics - **Liquid Volume:** 1 Litres - **Item Weight:** 1.11 Kilograms - **Item Form:** Liquid - **Manufacturer:** Brightwell Aquatics ## Images ![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 1 Liter - Image 1](https://m.media-amazon.com/images/I/71dD74US-oL.jpg) ![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 1 Liter - Image 2](https://m.media-amazon.com/images/I/813rQ1YGcEL.jpg) ![Brightwell Aquatics MicroBacterStart XLF - Concentrated Live Tank Starter for Cycling New Freshwater Aquarium and Establishing Nitrifying Bacteria, 1 Liter - 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, 1 Liter - 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, 1 Liter - Image 5](https://m.media-amazon.com/images/I/91j0HHxHI4L.jpg) ## 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 - Fluval BioMax Biological Material Remover, 500 g - Biological Filter Media for Aquariums - Fluval Carbon Filter Media for Aquariums, Premium Bituminous Carbon Inserts, 100-gram Nylon Bags, 3 Count (Pack of 1), A1440 --- ## 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.hr/products/437869786-brightwell-aquatics-microbacterstart-xlf-concentrated-live-tank-starter-for-cycling](https://www.desertcart.hr/products/437869786-brightwell-aquatics-microbacterstart-xlf-concentrated-live-tank-starter-for-cycling) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-05-25*