I have a gem tang here with upper and lower fin recession. I was told it was possible stray voltage. I checked and there's no stray voltage in this aquarium. Originally I thought another fish was picking on it but there's only a 6 line wrasse (very small) and a flame hawk in the tank with the gem. 100 gallon full reef is its home. I was told the fins would never grow back. This is permanent damage. Is this true? I feed frozen brine. Mysis nori and I just started putting selcon in the food. This fish doesn't seem to like pellets or flake food. He won't eat any dry food. He is healthy otherwise. An active swimmer. Very territorial.