My albino corydora is laying in the shell at the bottom of the tank on his side. i nudge him a little he swims around like crazy, then lays back down 5 or so minutes later. He was my only fish for a while and acts a bit adbnormal, swimming all around hovering towards top then actually bottom feeding. I got my rainbow sharks, he started hovering towards the bottom laying on the rocks...but never sideways. is he a gonner?