Could be stress I suppose, battling the cyano and hair algae has been a daily chore that involves sticking my arm in the tank and trying to extract as much as I can. I cut my lighting period in half and added a couple a powerheads, so it could just be an adjustment for the tang. Knock wood, I do appear to be winning the algae battle.
A chocolate chip? Really? Doesn't look like any CC pictures I'd ever seen before. The LFS couldn't identify it, and after a few hours looking around, I couldn't identify it either.
Whatever it is, it's eats everything and has doubled in size.