Small discs on rocks and corals

[Volacar]

Hi Reefers, in the past months, I discovered more and more of those small discs (0.5-2mm Diameter).
Recently it was especially pronounced by showing up ON the clove polyps (btw, which ones are the less invasive ones that are still a PITA to remove from Rock?).
The discs are easy to dislogde at least from the polyps and so far only found them on None of the Other softies nor LPS.

I am generally guessing some coralline algae? also haven't Seen how it would multiply, which it certainly does though.

 

[nautical_nathaniel]

Are you able to capture some in a glass bowl and take some closer photos?

 

[Volacar]

Kinda...on a paper with a magnifying Glass.
Big one as is the same Diameter as the whole Cluster with around 3mm
Some Sort of coraline?

 

[EnterName]

Maybe some Foraminiferans?

Marginopora vertebralis
(https://www.guamreeflife.com/species-id-v2/inverts/foraminiferans/)

Sorites orbiculus
(https://foraminifera.eu/singlerw.php?no=1015161&aktion=suche)​

 

[Volacar]

I mean, the Marginopora seems to be a exact Match, thanks!
Really crazy, Always thought those Guys would be Always 1mm and below.
Okay, photosynthetic and grazers makes them Reef safe as far as i understand
Anyways: why tf did they Pick my softies to chill on?