I need help. When I set up my 20 gallon aquarium, I put some Flame Tetras in to do a fish-in cycle (plus they're my favorite fish) and for some reason they all had fin rot. So, I bought the API medication stuff (Works perfectly btw), and my Flames have fully recovered. 4 weeks later. I bought some Cherry Barbs to go with my flames, went to bed, and woke up the next morning. One died (guess that's what I deserve for doing a fish-in cycle) and 2 of them both had the fin loss I had with the Flames. One of them only had a tiny bit of rot on its tail, and the other had rot on its face and all it's fins. So, I put some aquarium salt, stress coat, and the last bit of the API medication. Why does this keep happening? I always do fish-in cycles, and this has never happened to me before. HELP!