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Hi! I have a 20 gallon tank that housed 3 gouramis happily for many years. Over time they gradually died out and when the last one went I bought 2 headstanders and 4 honey gouramis to restock the tank. Well the place I got them from apparently didnt take good care of them, within 2-4 days half had ick and the rest just died. I did acclimate them slowly to my tank, pouring in small amounts of my water into their bag and treated them rasing the temp and adding salt but it did not help in time. So my question is after this incident, should I thoroughly clean my tank before I add new fish? Do you recommend completely stripping it down and restarting (going through cycling the tank again)? I've had the tank going fine for about 7 years and I've never had fish get sick so I dont know what do now. thanks!