This is turning into a "me posting only" thread, but who cares.
After coffee set in this morning, I started my morning stare at the tank. Found this...
Something had a little late night snack last night. My best guess is the long tenticle urchin. Right as I was going to bed, he was mowing that part of the algae. There was a LOT more there before I went to bed, and the mushroom was probably in the wrong place, wrong time. Ideas?