Hi there. My pipefish isn't eating and just wants to rest on the bottom - he's lethargic when he moves too. My measurements are pH 8.2, ammonia, nitrates and nitrites all 0. Specific gravity of 1.022. We have two Asian Emperor seahorses in the 130 litre tank and a red linkia starfish. His coloration is dull compared to when we first brought him home and he does seem thinner. Please help.