Growth ID

[Trinny]

Hi, could you please help me ID the White and red stuff growing on my live rock and tell me if I should be worried about it?

 

[Oxylebius]

They look like foraminiferans. I have them all over my tank. They can be red to orange that you see are the rhizopodia - here is more info on them: http://www.reefkeeping.com/issues/2003-07/rs/

 

[Trinny]

Thanks oxylebius, glad the white ones weren't wired looking aiptasia...