Can Someone ID this weird growth?

[DIFish]

Over the past 2 days 5-10 of these weird gray growths have popped up in my tank. All very small with a tiny stem and grey head. Have looked at some basic identification guides and can’t seem to find it. Tank is 2 month olds, 9.5DKH, 0 Nitrates, .01 Phosphate. Dry rock start with dipped corals. Any idea what this is? There seem to be growing at random places on my rock. can provide better pics and more details as needed. Referring to tiny grey dot under Zoa

 

[Nano sapiens]

You'll need to point out what you are referring to (I use MS Paint or similar to draw an arrow).

 

[DIFish]

 

[DIFish]

You'll need to point out what you are referring to (I use MS Paint or similar to draw an arrow).

Have about 8 of these in the tank. Can try and get a better picture but most are in patches of GHA and I think would be harder to ID.

 

[Nano sapiens]

Ok, do they move?

 

[DIFish]

With the current? Yes just barely when it ramps up flow. But they are seeming to stay in one spot after appearing, I have noticed this one here for two days now.

 

[Nano sapiens]

I'll go out on a limb and say that the morphology looks like the green algae Acetabularia sp.

https://milnepublishing.geneseo.edu/botany/chapter/acetabularia/

 

[DIFish]

I'll go out on a limb and say that the morphology looks like the green algae Acetabularia sp.

https://milnepublishing.geneseo.edu/botany/chapter/acetabularia/

How strange! Thanks for the ID, think you may be correct as I can imagine them looking like that once bigger and most of the are in patches of algae. Was worried it was some kind of pest but this makes sense. If anyone has experience with this please chime in, otherwise I am just gonna play it hands off and let my clean up crew eventually solve it.