Royal Gramma - MIA

[Dbarse]

Hi folks, my tank has been up and running for about 14 weeks now. I have 2 clowns, a Royal Gramma and a Benggai Cardinal (added in that order in 3 week increments, the clowns were added together). My Gramma has always been out and about swimming up and down the rocks etc until the last few days when Ive seen it less and less. It came out briefly to feed last night and then went back into its rock of choice and I havent seen it since. Its not uncommon for it to hang in the rock but would always poke its head out for a look, now, nothing. Any thoughts? Water is good, other tank mates are good and the Gramma appeared healthy when I saw it last night.

Thanks!