Review on Optimized Fluval Aquarium Biological Cleaner by Grace Brown

Between this and a few major water changes about 95% of all dirt has been removed and the rest is gradually deteriorating to the point where there is no mud anywhere in my tanks. A: Not satisfied with the price increase for this product. I decided to increase the frequency I get since I have two very large tanks to service. Future prices are anticipated, I may consider buying semi-annually.