After using the GreenEx for 4 days, I have lost 80% of my fish, it does not help get rid of Ick, I think it just poisions the fish so they die more quickly. I have moved my inverts to a QT tank, and I am now in the process of trying hypo. which I should have done to start with. I will find another fish store because I think they are not interested in the health of your fish, they are just interested in making a sale, and that is where I bought the fish that introduced ick to my tank to start with. I was stupid for not quarantining the fish to start with, and I have learned a valuable and expensive lesson. If I ever have a problem again, I will follow the message boards, I will not trust another fish store..