Cycle Biological Enhancer, Aquarium Water Treatment, 16.9 Oz., A8351

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.”

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.

This is my go to when I add new fish to my aquariums. It does a good job keeping the water parameters in check and encourage a healthy nitrogen cycle.

Great for water changes and weekly maintenance. Highly recommended

Good product, good price

Great item

My husband loves his fish. We always buy this

This works well in our fresh water fishtank

Es el mejor complemento para tu acuario. Provee de elementos biológicos para que el agua y los peces se encuentren en perfecto estado siempre

Très bon produit pour aquarium. Les produits canadiens Fluval sont vraiment à recommander pour que votre aquarium, comme le mien, soit sain pour vos poissons ! je recommande !

Works very well. better then easy-life bacterial combi system just make smell not so good. this makes very neutral to no smell and water gets crystal clear with proper filter my case Fluval 207 lots small gold fish 2 pleco and Siamese algae eaters well cycle 4 years.. I suggest when cycling what i found out to remove pre filters so that the bio filters and media get full colonized properly. do no use anything else and let nature take it's course.

Since I started putting this in my aquarium I have seen an improvement in my water quality and my fish seem to be thriving. I was recommended to use this once my tank started getting a weird smell and was advised there I need more beneficial bacteria and can confidently say I haven't had that smell again

I use this product when setting up a new aquarium (as part of the nitrogen cycle to promote healthy ammonia eating bacteria growth, a 6 to 8 week process) and as part of my weekly water changes. I feel that this product works very well, as my fish are all happy and healthy and I have never experienced any bad water quality issues (ammonia spikes etc). I use this weekly to add to my 200ltr, 60ltr and 30ltr aquariums when I do a water change. I change 20% - 30% of the water volume and add an appropriate dose of this stuff, however it's not really possible to overdose so it does not really matter if you add a little bit extra. I usually do add a bit more than stated on the label. I keep it stored at room temperature and the 2ltr bottle usually lasts me about 6 weeks. There is always a seal covering the opening after the lid has been unscrewed, so you know it is brand new and has not been opened / tampered with. This is safe for my fresh water aquarium inhabitants, of which I have many varieties. Pros: - The larger 2ltr bottle is excellent value compared to the 250ml or 500ml bottles - Quick delivery / repeat orders available - Far cheaper than my local pet store Cons: - Nothing I can think of really I hope this review has been helpful to you. Happy Fish Keeping!