i have a yellow coris wrasse in a small 15gal. tank & i usually see him out during the day cuz i know at night they bury themselves in the sand. today i've been home all day & haven't seen it once. i've heard they jump out sometimes so i checked all around the tank & nothing. so my question is has anybody ever heard of them stayin in the sand all day & not coming out at all for a whole day? any input would be appreciated thx