Yesterday I noticed he was skirting when I went to feed him, he was swimming but going to his side. I checked the ph in his tank and it was around 7 which it has always been even when he was healthier. I gave him a crushed pea, and he survived the night but still he swims a little and then lays on his side. For now, I put him in a bowl where he can get to the top easier ? I also changed the water in the tank but don't know if I should put him in right now? What should I do, should I put him back into the tank with a total fresh water change or should I add some of the old water? Help!