My Beta Fish is floating on his side? but still alive!?

Lyssa

New member
He is 3 years old eats a regular diet and has so far not had any sickness. Recently i cleaned his tank and just refilled it with tap water that was the same temp he is used to. I have always used tap water and it has never done anything to him before. He has trouble going to the bottom of the tank and keeps floating up on his side, his stomach is also inflated. Anyone know what this is?
 
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