--- product_id: 374373518 title: "Cycle Biological Enhancer, 250 ml (Packaging may vary)" brand: "fluval" price: "6180 som" currency: KGS in_stock: true reviews_count: 5 category: "Fluval" url: https://www.desertcart.kg/products/374373518-cycle-biological-enhancer-250-ml-packaging-may-vary store_origin: KG region: Kyrgyzstan --- # Safe for plants, fish & humans Eliminates toxic ammonia & nitrite Instant beneficial bacteria boost Cycle Biological Enhancer, 250 ml (Packaging may vary) **Brand:** fluval **Price:** 6180 som **Availability:** βœ… In Stock ## Summary > 🦠 Transform your tank into a thriving aquatic paradise! ## Quick Answers - **What is this?** Cycle Biological Enhancer, 250 ml (Packaging may vary) by fluval - **How much does it cost?** 6180 som with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/374373518-cycle-biological-enhancer-250-ml-packaging-may-vary) ## Best For - fluval enthusiasts ## Why This Product - Trusted fluval brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Eco-Friendly & Safe:** Formulated to be completely harmless to plants, animals, and humans alike. - β€’ **Effortless Tank Maintenance:** Ideal for new setups and ongoing water quality support without complicated chemicals. - β€’ **Toxic-Free Water, Happy Fish:** Effectively eliminates harmful ammonia and nitrite to protect your aquatic pets. - β€’ **Trusted by Thousands of Aquarists:** Highly rated with 4.7 stars and a proven track record for reliable aquarium health. - β€’ **Jumpstart Your Aquarium's Nitrogen Cycle:** Powerful bacterial blend activates immediately for a healthy aquatic ecosystem. ## Overview Fluval Cycle Biological Enhancer is a 250 ml liquid supplement that instantly introduces beneficial bacteria to new or established aquariums, accelerating the nitrogen cycle. It safely eliminates toxic ammonia and nitrite, ensuring a healthy environment for fish and plants without harmful chemicals. Trusted by thousands, it’s essential for anyone serious about maintaining a vibrant, balanced aquarium. ## Description Product Description Fluval Cycle biological aquarium supplement for new tank startups and regular maintenance 250ml. Set Contains: Cycle Review: Vielen Dank! Top! Gern wieder ! Review: This stuff is a absolute necessity, If you're new to owning fish or If you just want to set up a brand new tank. You need this Beneficial Bacteria to start up the Nitrogen Cycle in your tank and this is the best way to get it. For those who's new to owning fish or who doesn't know what the nitrogen cycle is and why it is important to your fish to keep them healthy, Im going to explain the easy way. Basically What the Nitrogen Cycle is and why is it important to your fish is because the Nitrogen Cycle is the process of GOOD BACTERICA that is introduced into your tank to help lower the Ammonia, Phosphates, Nitrate Levels that builds naturally from your fish, Un eaten food, and its Poop. Ammonia is the LEADING CAUSE OF FISH Death is given out naturally through your fish's Gills or its POOP, or uneaten food. now back to the Nitrogen CYCLE, which is very easy to understand if explained easliy with out all its technical mumbo jumbo.its basically the introduction of the GOOD bacteria into your tank, now your Ammonia, Nitrate, and Phosphate levels will go up, but don't worry its Suppose to do that, so don't go crazy doing water changes or adding chemicals to lower these levels no. The Beneficial Bacteria will do that for you in that case will provide a healthy Environment for your fish because the bacteria will eat up all the bad stuff your fish gives out. now your will have to monitor these Ammonia, Nitrate,Nitrate, and Phosphate levels with a test kit., and simply test everyday until you see the levels go all the way down to 0% once you see that all dropped all the way down then your tank has successfully gone through the Nitrogen Cycle and only then it is safe to start introducing fish into your new tank, as this procedure (Nitrogen Cycle) is only needed if you are setting up a brand new tank that is fresh out the box(if ordered online) or fresh out the pet store. ## Features - Powerful team of beneficial bacteria immediately inoculates aquarium water - Creates a safe biological habitat for your fish - Eliminates ammonia and nitrite - Will not harm plants; animals or humans - Size: 8.4 oz. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00FPIZ8Y0 | | Best Sellers Rank | #47,341 in Pet Supplies ( See Top 100 in Pet Supplies ) #401 in Fish Medication & Health Supplies | | Brand Name | Fluval | | Customer Reviews | 4.7 4.7 out of 5 stars (6,443) | | Global Trade Identification Number | 00015561183499 | | Item Form | Liquid | | Item Type Name | Cycle Biological Aquarium water treatment | | Item Weight | 8.45 Ounces | | Liquid Volume | 8.4 Fluid Ounces | | Manufacturer | Hagen | | Manufacturer Part Number | A8349 | | Model Number | A8349 | | Target Species | Fish | | UPC | 015561183499 | | Unit Count | 1 Count | ## Product Details - **Brand:** Fluval - **Item form:** Liquid - **Item weight:** 8.45 Ounces - **Liquid volume:** 8.4 Fluid Ounces - **Manufacturer:** Hagen ## Images ![Cycle Biological Enhancer, 250 ml (Packaging may vary) - Image 1](https://m.media-amazon.com/images/I/71CbLgtkAbL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Questions & Answers **Q: How much do I need for setting up a new 75g freshwater tank?** A: After tank is set up, keep everything running except for lights and if you are running a saltwater tank keep the protein skimmer off. Pour in half of 16.9 oz. bottle upon set up, On the 8th day ,pour the rest in. In my experience on day 14 your tank is cycled, however testing tank water , 1 time I had to wait 16 days. It is recommended to dose the tank when new arrivals are added, I did this for 1week then stopped, I have used this item for 15 years when the original was sold under the CYCLE name which came in 8oz. and 16 oz. Works every time. **Q: What size bottle is recommended for a 6 gallon tank?** A: The 8.4 oz seems like a better deal overall compare to the 1oz and 4 oz. its a little cheaper. However, you would need this every time you do a water change. Some people don't add more when then do a water change, but when you take out water from your tank, your taking out some of the bacteria, thats why its necessary to replace the bacteria. This is by far one of my favorite nitrifying bacteria. This is good to cycle a tank. Plus this bacteria is something you cannot overdose. So for a six gallon tank you can add three to 4 full caps to get a good amount of bacteria in there to start the cycle. Then you can add your first fish. After you add your first fish wait for a few weeks before you add more fish. The first initial fish will help feed the bacteria you put in. This way over a few weeks it will create the ecosystem you want. To be honest Allie, some people add two much fish the first time they get an aquarium and its a big mistake. Eventually they may have a lot of fish loss due to they tank not being a ecosystem. You want to make sure you create the ecosystem first before you add a lot of fishes. Thats why for the size of your tank one fish is ok with the addition of the bacteria will help create the ecosystem. After a few weeks you can add more. Also if you are doing tropical or saltwater fish make sure you have a heater. If your doing goldfish your not required to have a heater. Acclimate your fishes well too. If you have any more questions feel free to contact me. **Q: What size do I need for a 40 gallon breeder tank?** A: The directions state 25 ml per 10 gallons on day 1 (100 ml) and then 10 ml per 10 gallons on day 2 and 3 (40 ml per day) so a total of 180 ml for your 40 gallon breader. I do a sustainment treatment every week of 5 ml per 10 gallons (another 20 ml). I think this is a great way to get and keep a large colony of beneficial bacteria. Good luck with the new tank! **Q: If I put this in a new tank how quickly will it cycle the tank? Will the bacteria stay in the tank or die off after a bit? Is it cycled permanently?** A: I would recommend API Stress Zyne Plus. My fish kept dying for the first few weeks. It took almost 8 weeks to for the tank to cycle. So get 2 or 3 fist to start and nothing fancy. Keep testing for Amonia levels. Once the tank cycles, it should be at 0. Then you can get fish you want to keep. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by M***L on 24 September 2025* Vielen Dank! Top! Gern wieder ! ### ⭐⭐⭐⭐⭐ Review *by J***S on 16 April 2014* This stuff is a absolute necessity, If you're new to owning fish or If you just want to set up a brand new tank. You need this Beneficial Bacteria to start up the Nitrogen Cycle in your tank and this is the best way to get it. For those who's new to owning fish or who doesn't know what the nitrogen cycle is and why it is important to your fish to keep them healthy, Im going to explain the easy way. Basically What the Nitrogen Cycle is and why is it important to your fish is because the Nitrogen Cycle is the process of GOOD BACTERICA that is introduced into your tank to help lower the Ammonia, Phosphates, Nitrate Levels that builds naturally from your fish, Un eaten food, and its Poop. Ammonia is the LEADING CAUSE OF FISH Death is given out naturally through your fish's Gills or its POOP, or uneaten food. now back to the Nitrogen CYCLE, which is very easy to understand if explained easliy with out all its technical mumbo jumbo.its basically the introduction of the GOOD bacteria into your tank, now your Ammonia, Nitrate, and Phosphate levels will go up, but don't worry its Suppose to do that, so don't go crazy doing water changes or adding chemicals to lower these levels no. The Beneficial Bacteria will do that for you in that case will provide a healthy Environment for your fish because the bacteria will eat up all the bad stuff your fish gives out. now your will have to monitor these Ammonia, Nitrate,Nitrate, and Phosphate levels with a test kit., and simply test everyday until you see the levels go all the way down to 0% once you see that all dropped all the way down then your tank has successfully gone through the Nitrogen Cycle and only then it is safe to start introducing fish into your new tank, as this procedure (Nitrogen Cycle) is only needed if you are setting up a brand new tank that is fresh out the box(if ordered online) or fresh out the pet store. ### ⭐⭐⭐⭐⭐ Review *by J***O on 12 November 2024* Es el mejor complemento para tu acuario. Provee de elementos biolΓ³gicos para que el agua y los peces se encuentren en perfecto estado siempre ## Frequently Bought Together - Fluval Cycle Biological Enhancer, Aquarium Water Treatment, 8.4 Oz., A8349 - Fluval Waste Control Biological Cleaner, Aquarium Water Treatment, 8.4 Oz., A8355 - Fluval Clarify Bio for Aquarium Water Treatment, 4-Ounce --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kg/products/374373518-cycle-biological-enhancer-250-ml-packaging-may-vary](https://www.desertcart.kg/products/374373518-cycle-biological-enhancer-250-ml-packaging-may-vary) --- *Product available on Desertcart Kyrgyzstan* *Store origin: KG* *Last updated: 2026-05-07*