i have a cherry barbs, in the middle of his body(male) its no so red, kind like he got hit or hurt something just in that one spot, last night , i found him swimming around odd. like flopping around or facing striaght down..i though he was dying for sure last night. i wait up for a few hours and he swam like a retard but he is still alive, i went to bed and i got up and he swims all oddly leaning sideways, twisting, but he is ok.is he like a retarded fish or is he sick??