Awhile back i had purchased a crown tail that was doing real well in a five gallon. the five gallon ended up having some hair algae i didn't want to continue dealing with so i ended up moving the guy to my already running 20 gallon with some neon tetras. they don't seem to ever bother one another and ahven't for the last 4-5 months he's been with them. but this past week or so i've noticed the betta being real lazy. only staying slouched up in the corners or edges of the tank. his fins are clamped slightly so i'm not sure. the water is upkept etc and they're all fed either flake food or frozen blood worms. every other day i try and squeeze the betta some hikari gold pellets.