I added a small yellow coris wrasse to my tank 2 weeks ago yesterday and have not seen it since it hit the sand 2 mins later . The only other fish in the tank are a pair of osc. clowns and a firefish . The fish looked healthy and fat at the fish store . I know they can hide for awhile when first added , but at what point should I consider it gone . I wake up everyday , hoping today will be the day it shows face .