my moms betta

[lyssa82]

hi my moms beta used to swim and play with us and now he swims and hides in the back and the if he does come to where we can see him he lays on the rock and then goes and hides behind the the trees and filters and his castle any ideas it has only been in the last week.....he was fine before the heat wave but his tank has stayed with in the same temp the whole time the heat eave happened or at least it seemed too.