Yes I have two aiptasia but that maroon stuff isn't cyano sorry try again. I have some cyano on my sand bed it's completely different.
Try siphoning it.. if it is slimy and sucks off rather easily in sheets, then it is cyano. If it is hard, or stuck solidly onto the rock, then it isn't.
The other two small anemones next to the mushroom are aiptasia.
That's exactly it cyano is slimy this stuff is like sponge you have to pull it off
Cyanobacteria is one of the most prolific microorganisms in the world...Just because it doesn't look exactly like a picture doesn't mean it isn't Cyano.