I went to the store today to look at the bettas and ended up buying one for my empty 10 gallon. I believe he has an eye tumor and know nothing can be done if it really is but I still want him to be happy and live a long happy life. It doesn’t seem to bug him since it’s still pretty small. If anyone knows if there is a way to fix this (or if it isn’t actually a tumor) any help is appreciated. I also know his back tail needs some work. Just hoping with plenty of water changes it will grow back.