Its just that I read a post of Glidergirls this morning. She tried to swap a magenta dottyback from one tank to the other. She moved all the live rock and there was no sign.
Once the rock was reassembled, the dottyback came out again.
Just wondering whether he had been looking for a nice cave and perhaps he got a little stuck or something??
I am not sure of his size or the sizes of your rock, but some of thise pieces do look fairly big.
Here's hoping with everything I can cross, crossed.