I have a 55 gallon tank with Mbuna Cichlids in and one of isn't right. My Orange Zebra is swimming vertically not horizontally just under the surface. He had some white fungal looking stuff on his fin and tail so I'm medicating him for that and it's almost gone now. He also has grey stripes down his body and round his head, almost looks like he's dirty not yellow. My other fish are fine, swimming round doing heir normal thing. Any ideas?