Hello, I know there are a lot of similar posts but I just wanted to see what y'all thought about my specific situation... First off, my tank: I have a 5 gallon, filtered (tetra whisper internal filter that came with the tank filled with biorings and a sponge like media), heated and moderately planted. The tank is tested (ammonia, nitrates, nitrites) weekly and is cycled. I do weekly 20% water changes. So here's my situation... I had a betta (Prince Loo ) for about 2 years and he suddenly died of dropsy - I had purchased live plants and a few neurites from my LFS a few months before that and I was suspicious that maybe something nasty hitched a ride on them. Another possibility is the ambient room temperature would sometimes be unsteady as we didn't have central air. The tank sat empty for a few weeks and then I got another betta fish (Gluten Free Fish Sticks ). He was fine and adapted well, but I was still worried about the temperature fluctuations so a few months later I moved to a new house that has central air. The only thing is, after the move he was lethargic at first, it really really stressed him out and after some time his fins started looking tattered. I treated him with Kanaplex to no avail... I live in baltimore and the tap water isn't great so thinking this might be a factor, so I slowly over 2 months switched him over to spring water and he seemed to be doing better (fins growing back, more active etc.). In the last few weeks however (about 8 months post move) he really took a turn for the worse and developed pine-coned scales and quickly passed. So here's my thing-- this is my second betta to die of dropsy. I know its a symptom and not a disease but I'm worried that maybe there's something nasty persisting in my aquarium. While it would be great to not have to take down the tank and sterilize it, I'd rather do that than see another fish go this way. What should I do? What is the best way to go about it? And what about the snails? Thanks so much!