Howdy. Been in the reef hobby for a very long time, but I have never seen this growing in any of my tanks. Any ideas? I have aiptasia and initially thought it was aiptasia that was retracted, but some cliser inspection I can now confirm it is not. This is the best picture I can post as it is a zoom and the rock ia at the back of the tank.
The tank is a 120 gallon and fairly new. It is about 6 months old.
The tank is a 120 gallon and fairly new. It is about 6 months old.