Hi RC, I am new to the hobby. So I need some advice. I have a black ice percula clown and a black and white in a 55 gls live rock tank. It looks like they've paired up. I've had them for 48 hours and they seem to only hang around at one end of the tank. When I feed them, they do come out, but most of the time, they stay in the corner. In the last two mornings I have found them in the corner swimming on their side. I thought they were sick, but once they saw me they came back down and looked normal. Is this normal? Any description of behavior or books would be greatly appreciated.