I have a tenuis that has been doing great, nice growth and polyp extension. Then about a week ago I noticed its polyps were somewhat retracted. I didn't really think anything of it until the poor polyp extension continued for a few days and I decided to perform a full test on my water parameters. Everything looks great and has been consistent. After observing my tank for a while, I noticed that one of my springeri damsels is nipping at the tenuis' polyps, but luckily it only seems to be interested in this colony. The next day the tenuis started RTNing midway up one of the branches. I immediately put in my fish trap but haven't been successful as of yet. As the flesh began quickly receding, I clipped off the affected/infected half of the colony, trying to frag what I could. Has anyone else ever dealt with this before? fish nipping causing RTN? Or is it more likely something else that infected the stressed/nipped coral? Here is a shot of the colony maybe a month or two ago.