Hi, did any 1 experience yellow tang swimming head down and it seems like it can't control it directions. The tang together with another purple tang are in my quarantine tank towards the end of the hyposalinity stage (4th week) and this thing happened. But the purple tang is alrite. Is it a kind of disease such as bloated belly or dropsy? Should I bring the salinity up to normal? Can any 1 advise? Help!!!