there mouth, if open they are stredd. also if they are eating and inflated. if it is deflated for a long period of time and not exspelling wast then there is oen thing up with it.
A 46 gal
bow front (Soft coral) reef tank with a 10 gal
sump. And a 30 gal
and Clam) reef tank hooked up to the sump of the 46 so they share water.