Bests & Worsts Reviews from Amazon

I put one package in the tank and waited. It just sat there. It did not foam up, it did not even bubble up. 6 hours later my tank was just as it had been before. I tried a 2nd package and the very same results - ABSOLUTELY NOTHING HAPPENED !!!!!!! This is a waste of my time and money. Too band there is a ZERO star rating. But even a zero rating tis too high for this !!