You gotta notice where it is residing. You must get them feeding soon. Jawfish health decline amazingly fast. For me, it started feeding hours after introduction into my tank. It did'nt venture out for food. So I squirted garlic enriched mysis into its cavern...whereby it cautiously took the food items. Eating cyclopeeze too. Will try fish eggs tomorrow. Starting must target feed. After when they settle down they become real bold. My old one will swim all the way out to grab food, not in a hurry to hide back into the burrow. Anyway..most likely yours is hiding. They don't MIA that easily.