Weird looking marks on my YW Goby
Hey guys! My YW Goby has weird markings today. He seems fine, eating, swimming around like usual. He has been sleeping in a new spot in the tank recently, simply because he's too big to go where he use to go. It's in between 2 pieces of live rock, where red mushrooms grow. He's actually sleeping under the red mushrooms, with them touching him. Any ideas with these markings are?? Coral stings? Infection? Parasites?
BTW, he has been in my tank over 2 1/2 years, but he did get very sick once, about a week after we brought him home, but has been fully recovered (and a grumpy old man since then...lol)
All water parameters are perfect, no ammonia, no nitrites, no nitrates and no phosphates...etc...
All help would be truly appreciated!!!