my choco cic has a strange habit. he is consistently prowling below the surface of the water, with his head pointing up. like when fish gulp at the surface when there isn't enough aeriation in the water. but he doesn't gulp, just hangs there for a while. he's eating regularly (has a big appetite, reminds me of an O) none of the other fish are doing this. (GT, O, and Inc. cat), lots of surface movement and water pars are all within tol. is this a common behavior for this kind of cic? the ones at the store were doing it to, guy said they were just getting used to the water, but i've had mine for 3 weeks now (in a fully cycled tank)