I introduced an approximately 1 inch yellow coris wrasse about a week ago. It hid for a day but was out for the next day or so. intermittently. I have not seen him for the last 4-5 days. I know this behavior is normal for these. My concern is that the tank is fairly sterile. And by that I mean there are no pods built up in this tank yet. I have been feeding a bit heavy in the hopes that he is sneaking out to eat something left. At what point should I be concerned and sift through the sand looking for a dead wrasse? Thanks for the help!!