This sprung up overnight and I have noticed areas popping up in other areas of the tank as well - mainly on the back glass and a few other places on the rock.
I fed the tank some brine shrimp a stray piece got caught on this guy and I witnessed a sort of tugging going on - like it was fighting over it. It twitches.
These I spotted about 2 weeks ago - have tried to ID it several times without any luck... the tentacles retract when its bothered. I do have an aiptasia in the tank - but these look nothing like it. They are VERY small there are about 8 or 9 total
Thanks in advance - this is a new tank awaiting a TBS package - would like to know what these things are before I add the TBS.