My betta Wall-e has been floating at the top of his tank for the last couple of days. He is not floating on his side, or his back, he is floating in normal position staring at the corner where we feed him. He has already been fed, and seems to be staying near the top of his tank. He will swim down to the bottom of the tank, swim around, then go right back to the top and swim along the surface of the water, and stop and just float staring at the corner.
What is wrong with Wall-e?! I bought him about 2 months ago. I have water sitting on the counter treated already just waiting for it to be room temperature, and I'm doing a 100% water change tomorrow. I read that it might be Swimmers Bladder (?) and to give them clean water, and fast him for 3 days. Should I fast him for a few days? Do you think that's what he has?
I don't want Wall-e to die! :(