ID these please

[gml1973]

Can somebody help me ID these growing on the live rock please. Thanks

 

[ISpeakForTheSeas]

Possibly a Neomeris sp. (macroalgae)?

WheatToast said:
Neomeris sp. This is a rare calcified green macroalgae that usually dies out in captivity. However, it has a rare chance to go invasive. Since it is calcified, I would assume few organisms could consume it besides urchins.
https://www.marineplantbook.com/marinebookneomeris.htm
https://www.reef2reef.com/threads/neomeris-annulata-reboot-only-option.279012/

 

[gml1973]

Thank you