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

This is a very effective BB. I keep it on hand all the time and add it every time I do a water change in our aquariums, which at this time is 5 tanks. Have never had any issues with it. It was recommended by our LFS. Excellent Product.

Easy to use

This product it’s amazing!!! I try different brands and not good as this one!!!!

The first bottle of this product purchased at a fish store didnt have small white chunks. I also notice this product is set to expire within a few months of purchase. Due to the low price point I chose not to return/exchange them.

I cant tell if this cycles a tank on its own but it does do something. I think it helps. I got this after I started a tank cycle and then accidentally stalled it and didnt know what to do. My ammonia was being converted to nitrites, so phase 1 was complete, but the nitrites were not being fully converted to nitrates. This lasted months with no change so I definitely stalled it. I figured out a few things I did wrong and I bought this product. As soon as I added this product to the tank, the water would start to look crystal clear. After a while of dosing this as instructed and helping the cycle in other ways, the nitrites were finally converted to nitrates and the tank was cycled.

I use this when starting a new tank and my tanks cycle in 3 days. I also use it when I add fish and when I do a water change. You cant beat it. Great product! I recommend.

The best for instant cycle!

Great stuff to kick start nitrogen cycle

Works well with my fish.

So far levels are at what they should be and all is well... would buy again for maintaining after water changes.