Just got myself a mandarin two days ago n tossed it right into my DT 75g reef tank 8months old. Since then its been hiding in rocks and won't come out. I squirted a bunch if frozen mysis shrimp into the caves and I saw him pecking around but couldn't tell if he was actually eating it or not. Is this normal that he won't come out of the caves? I have 6 other fishes in my tank