Hi, my brother bought a betta and put him in a bowl (temporary) and we clean its bowl once a week. We haven't had it that long, maybe a one month or a month and a half. About 4 days ago he stopped eating, then I noticed his stomach got bigger, maybe bloated. I also recently noticed how he is getting a bit pale. I think a tiny clump of scales came off and he darts a way a lot. I know he's sick but I'm not sure with what as I want to buy medicine before he dies but I don't know what medicine to buy. Also how long will he live before he dies? Thanks you for your time.