they sure do lol i have a sailfin and a yellow tang i feed both nori and other green things.they poop and they poop good if you ask me its a healthy sign if you think of it tangs are always grazing and are always moving and something has to give, so they poop its the job of most fish breathe,eat,expell,reproduce . so lets figure out what can be done to lighten your poop load how often are you feeding nori? how much?? are you feeding them anything else as tangs have a large appetite for most anything that floats?? cheers
