I have a difficult problem with guppy tanks, I've tried all the chemicals to clarify, water changes, checked the water, removed the colored stones, thought that was the problem, added live bacteria , anti-stress covers / quick start. NOTHING worked for me. I tried this stuff and noticed a significant difference in cleaning within a day! I'm going to give this product a five star rating and try another treatment in a few days and I'm pretty sure it will go away completely. It didn't work as fast as the instructions say but I don't think it's because of this product, I think it's a problem with my tank. Still happy! See attached before and after photos. It should be noted that a reddish film formed on the top of the tank which startled me thinking my fish was going to die but I just peeled off the film and there was no problem.
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