---
product_id: 374373518
title: "Fluval Cycle Biological Enhancer, 250 ml (Packaging may vary)"
brand: "fluval"
price: "31098CFA"
currency: XOF
in_stock: true
reviews_count: 5
category: "Fluval"
url: https://www.desertcart.sn/products/374373518-fluval-cycle-biological-enhancer-250-ml-packaging-may-vary
store_origin: SN
region: Senegal
---

# Rapid ammonia & nitrite elimination Safe for plants, fish & humans Instant beneficial bacteria boost Fluval Cycle Biological Enhancer, 250 ml (Packaging may vary)

**Brand:** fluval
**Price:** 31098CFA
**Availability:** ✅ In Stock

## Summary

> 🦠 Transform your tank, transform your vibe!

## Quick Answers

- **What is this?** Fluval Cycle Biological Enhancer, 250 ml (Packaging may vary) by fluval
- **How much does it cost?** 31098CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/374373518-fluval-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

- • **Toxin-Free Water Clarity:** Effectively eliminates harmful ammonia and nitrite for crystal-clear water
- • **Plant & Pet Friendly Formula:** Gentle on aquatic plants, fish, and even humans—no compromises
- • **Stress-Free Fish Environment:** Creates a stable, safe biological habitat that reduces fish stress
- • **Trusted by Thousands of Aquarists:** Top-rated with 4.7 stars and thousands of happy customers worldwide
- • **Jumpstart Your Aquarium's Ecosystem:** Powerful bacterial blend accelerates tank cycling from day one

## Overview

Fluval Cycle Biological Enhancer is a 250 ml liquid supplement designed to rapidly establish beneficial bacteria in new or existing aquariums. It accelerates the nitrogen cycle by eliminating toxic ammonia and nitrite, creating a safe and stable environment for fish and plants. Trusted by thousands with a 4.7-star rating, it ensures healthier aquatic life and clearer water without harming pets or plants.

## 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: Fluval Cycle Biological Enhancer works exactly as described. It helped establish beneficial bacteria quickly and made cycling my aquarium much smoother. My fish showed less stress, and water parameters stabilized faster than usual. A must-have for new tank setups and water changes.”

## 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 |
| Batteries Included | No |
| Best Sellers Rank | #7,846 in Pet Supplies ( See Top 100 in Pet Supplies ) #46 in Fish Medication & Health Supplies |
| Color | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (6,375) |
| Date First Available | 6 January 2014 |
| Item Form | Liquid |
| Item Weight | 239 g |
| Item model number | A8349 |
| Number of Items | 1 |
| Pet Type | Fish |
| Product Dimensions | 5.84 x 5.84 x 15.24 cm; 239.55 g |
| Quantity | 1 |
| Size | 250 ml |
| Volume | 250 Milliliters |
| batteries required | No |

## Product Details

- **Brand:** Fluval
- **Item form:** Liquid
- **Item weight:** 8.45 Ounces
- **Liquid volume:** 8.4 Fluid Ounces
- **Manufacturer:** Hagen

## Images

![Fluval Cycle Biological Enhancer, 250 ml (Packaging may vary) - Image 1](https://m.media-amazon.com/images/I/71CbLgtkAbL.jpg)

## 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 N***E on 16 December 2025*

Fluval Cycle Biological Enhancer works exactly as described. It helped establish beneficial bacteria quickly and made cycling my aquarium much smoother. My fish showed less stress, and water parameters stabilized faster than usual. A must-have for new tank setups and water changes.”

### ⭐⭐⭐⭐⭐ Review
*by J***O on 12 November 2024*

Es el mejor complemento para tu acuario. Provee de elementos biológicos 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?

- 🛒 **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.sn/products/374373518-fluval-cycle-biological-enhancer-250-ml-packaging-may-vary](https://www.desertcart.sn/products/374373518-fluval-cycle-biological-enhancer-250-ml-packaging-may-vary)

---

*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-02-25*