So he started to move around the boulder and into the open and out into the light and I thought maybe you were right it is a she but now he has retreated again away from the boulder into the very back corner of the tank under a couple of return lines and way too close to the powerheads, I think he is suicidal.
He till looks fine, no gaping mouth or anything but how long can he go without light? Also, I have not fed him at all, should I give him something?