he's hanging at the bottom, not moving a lot, just every once in a while n to keep other fish away from him.. he'll chase em off a little, he has no signs of disease on his body, but does seem to be gasping... his mouth/gills moving more than the others.. not looking good, is it? I changed 25% yesterday was gasping b4 that tho.. I installed new canister filter then too. temp at 24 c and do not have testing equipment for water yet, (i know yall gonna reem me for that) but everyone else seems fine..