so I bought a fathead anthias and slowly acclimated it to my water and it's been tucked into a rock for the last few hours in the same spot not breathing hard or looking stressed but not moving(except his eyes when I look at it). Should I be worried about it? Or is it a normal thing for fish to do? I have a yellow tang, 4 blue/green chromis, 1 diamond goby and a clown fish. In a 50g sps reef.