Don't worry about it. I bought 2 cleaners last September. I didn't see them at all for 3 days and assumed they were dead. Turns out they were just shy at first and hid in the rocks until they were comfortable to come out. Today, they are twice the size and they are all over the place. The first time one of them molted, I saw what I thought was a dead cleaner on a rock only to be shocked by seeing him alive a litttle later on. I now have a 3rd cleaner plus one coral banded shrimp and they are as much fun to watch as fish. Good luck with yours.