Help! i've had a volitans lion for 2 yrs... suddenly a loss of appetite has him floating around aimlessly. we've tried re-arranging landscape for more space; silversides, krill, and everything short of live food (don't want to have to feed live if possible--has been eating these other foods since small). water parameters fine--other fish (blue-faced angel, blue jaw trigger, harlequin tusk, pearl-scale butterfly, etc) are all fine. nothing new added recently. he was happy for >1 yr, then started spitting and splashing over the past few months... now this!! ANY ADVICE??