I'm still new to sps and have not experienced burnt tips as my alk has been rock solid at 8.3. I noticed some of the tips on my garf bonsai are a white while all the other pieces are fine. I suspect the pretty guy in the background but have not seen it yet. Only other fish are a yellow tang, bristle tooth tang, six line and a tail spot blenny so I don't suspect them. Those of you with more experience does this look like a fish is nipping this piece. I don't want to remove the angel but I will if it's nipping.