Fish tanks don't kill fish
Dropsy is highly unlikely
Getting rid of the tank is silly
Obviously you keep doing something wrong and aren't correcting whatever it is
I'm not saying the tank killed them I'm saying something in the tank could have killed them. I'm not sure if I did something that caused the fish to get sick and die?
Tayuyya Uchiha · 2 hours ago
Diagnosing fish problems requires reviewing everything you do, everything you use, all the chemicals, maintenance, aquarium specifications, filter, fish and water chemistry test results. There are some common mistakes people make and you'd have to rule them out first.
The main reason I answered at all was to try to counter a couple of the absolutely stupid suggestions you got. There's no need to throw away the tank.