Hi there, I got back from a month-long holiday just under a week ago. I trusted my friend to look after my betta Severus while I was away, and when I got back the whole tank was green. I spent 3 hours trying to clean it (and there's still some left over even now. Severus also looked like his fins and tail were rotting (pictures attached). As soon as I got him home I gave him some Bettafix, but I don't know what treatments I can use on him when I have snails in the tank too.