It has to be something that has been in that tank, because the only fish that have died have been the ones that have been exposed to the water in THAT tank. My guess is the cats had something on their paws or got something in the water. I'll be bleaching the tank and putting it into storage.
4 girls, one platinum halfmoon male, one veiltail male, and one mustard gas male in the past month.

I only have 4 females left out of my 7 girl sorority (plus a girl that was being fattened up). I was going to breed all three of the males. This is really disappointing and I don't think I'm going to be buying any more Bettas for a while. I'll just put all my focus on my others and I'll put my girls into a 10 instead of the 20.