I've had my Betta for a month now and this morning I noticed his tail looking different. Im guessing he's bit it or snagged it on something...? I don't know what happened, he was fine last night and this morning his tail isn't how it was before. I also noticed a fair amount of bubbles on the top of the tank, they were larger and not together so it wasn't a bubble nest. I did a 40% water change just now and i checked the water temp and its fine. he's being upgraded in a few days to a bigger tank with a light and filter. The photo where he's facing to the left is the first day I got him and the other photo is from today, when I noticed something up with his tail. Is there anything I can do for him ? Did he do this to himself? Was it something I did or didn't do?