I know what you mean. Mine is my favorite fish in the tank as well. I hope it isnt anything serious. Let's hope they are just scuff or scratch marks. Like i said, mine does things to get those. Good luck getting the pic. Mine will be out and in my face at the glass but the second I put a camera up, he darts to his little hole in the rock head first and leaves his tail sticking straight up in the air till I put the camera down.
Wet/dry converted into sump with a Bubble Magus NAC7 cone skimmer, MAG7 return, 200 micron filter socks, Vortech MP40w + two returns for flow. Current Sundial T5 + two retro Icecap T5's (6 bulbs),