Can someone help indentify the item I circled in yellow? It has grown from nothing to this within about 10 days. It is super hard like a shell and I cannot get if off the rock with normal tweezers. I would have to use more force I think. (Don't want to bother it further until I know if it is harmfull or not). It does not move. The only thing I see from time to time is a hair like tentacle coming out of it similar to a ricordea florida that is trying to catch some dust food. Nothing else coming out or going in, even at night. This is a 2 months old tank, all parameters are within reason, only other issue is explosion of amphypods.
