Hi all, I recently bought a Betta, his name is Mizu, and noticed when I bought him that he had a small white mark on his side. It’s been two weeks now and I’ve noticed the mark is a lump that is protruding more and more. It looks flat in photos but hopefully you can see in the second photo that...

Housing What size is your tank? 10 gallons What temperature is your tank? 76 F Does your tank have a filter? Yes. Does your tank have an air stone or other type of aeration? Yes. Is your tank heated? Yes. What tank mates does your betta fish live with? Only some pond snails that snuck in on a...