New hammer coral. Only othe coral I have is gsp on back wall. Both seem like they’re doin well as of now. Also I have gotten a royal gramma about 4 days ago. He is hiding in a hole in the rocks and I haven’t been able to see him at all during about three days. Is that normal for a new royal gramma ? The only other fish in the tank is two occ clowns and a ywm goby/pistol shrimp.