At the beginning of July I had a zebra danio who was extremely bloated. After fasting her and trying the pea method, her belly started to go back to normal until she suddenly passed away. I never noticed anything else wrong with her; she was active, had a healthy appetite and from the size of her belly, you'd have thought she was a livebearer. Here's the original thread with pictures included - https://www.fishlore.com/fishforum/zebra-danio/173564-pregnant-something-else.html I just finished watching my tank like I usually do, when I noticed one of my platys and longfin danios rubbing against the decorations. I do not believe it's ich as I have seen no white spots. They too have healthy appetites and swim normally but the scratching worries me. I added my corys last night (in quarantine for a month) and before them it had been weeks since any new fish were added. It is 36 gallons and I run a AquaClear 30 and 50 and the temperature is kept between 75 - 77F. The tank is established with 0, 0 and 5-10, pH 8.2 but all fish have been acclimated properly. I do weekly water changes of 30% and try to vacuum the gravel every couple of weeks. My question is should I treat the tank for parasites? It houses skirt tetras, platys, corys and danios. I have ParaGuard on hand but wasn't sure if it's safe to use with corys in the tank. Is there any other precautions I should take? Anything else I could treat with? I currently do not have an available QT but I am looking to get another tank in the (very) near future. Thanks in advance!