I just lost a Betta that I'd had for over three years a few weeks ago...I'm pretty sure it was dropsy, because he did the whole blowing-up-like-a-balloon/pineconing thing. He seemed pretty happy and healthy prior to that, except that he wasn't as active as when he was younger, but he would swim around for food or if my cat came to say hi (his tank has a lid!)
So I got a new one two days ago (after I washed the tank out with epsom salts acclimated the room temp, treated the water)... he looked great in the pet store, very bright blue, active, etc. He looked fine yesterday, but today I found him dead. There was a white spot on his belly, he looked paler overall, his eyes were white, his fins looked like they had fallen apart (when I scooped him out, they seemed to be somewhat falling apart). There are also a few pellets of food floating at the top of the tank looking really fuzzy.
I would like to get a new fish...but will the same thing happen? Slash, how can I make sure the same thing doesn't happen?
Thanks for any help you can offer!