Hello all, Bilbo is my second betta fish so I am aware of things like tank cycling and water temp for bettas. I got Bilbo last summer and a couple of months in introduced a mystery snail for a tank mate... things were going great but eventually I noticed parts of Bilbo's tail were shredding and/or falling off. I moved him into a quarantine tank and with a mixture of marine salt and microbe-lift his tail started growing back. Out of fear this would happen again I kept him in his smaller tank until his tail was fully restored. Two weeks ago I decided to return him to his larger tank (this time minus Smeagol the snail... I believe his waste loaded the aquarium with too much bacteria which led to the fin rot in the first place). He seemed happier and healthier than he's ever been... super playful, always checking up on what I'm doing when I walk into the room, finally eating normally. Then just now I got home from work and realized his tail had completely shredded/fallen off again. I am distraught. What am I doing wrong? I've attached a picture to show the extent of the damage in just one day. When I left this morning he was fine. Please help me, I feel like I am letting the little guy down!