Last night I bought a male calico dalmation molly. At the store he was displaying beautifully & chasing the females in the tank which is why I chose him (besides his BEAUTIFUL calico colors). This morning, he was floating sideways (still alive) in the tank. I've since removed him & put him into a 1 gal tank that I have to try & "fix" whatever may be wrong with him. What happened??? I have 3 females & all are doing fine.

Any ideas/suggestions???