Before I run the battery of tests, I'm wondering if anyone can identify what type of damage this is. Does it look like STN/RTN, sting from another coral? Bleaching from too much or too little light? It was doing great in this spot for quite a while, then this spot showed up. The surrounding tissue seems to be okay though, and I don't think the damage is spreading any more. It has stayed this general size for a couple weeks now. I forgot what type of encrusting montipora this is. It's something mystic or whatever.