Every time an SPS frag fell to the tank bottom during the night it would be all white the next morning. I assumed because it fell into the sand. Well this morning I may have found the culprit. A 3" branching monti frag fell and I could not find it. Finally my blue linkia starfish moved from behind a rock and there was the frag with parts of it all white. I didn't realize they eat SPS polyps. Never touches the zoas or plays. Could be coincidence but none the less interesting.