Red flake algae growth?

[echoplex]

This red stuff is growing off a single rock, nowhere else in the tank. Fairly brittle, and it's growing about 1mm a week. What is it?

Thanks!

 

[Fluff]

This is actually not an algae at all, but instead an animal. They are foraminiferans. They are harmless detrivores.

 

[steve-s]

Not algae, their foraminiferans.

http://reefkeeping.com/issues/2003-07/rs/index.htm

Cheers
Steve

 

[steve-s]

Sorry Cindy, I was looking for the link and you beat me too it...

Cheers
Steve

 

[Fluff]

Hey, your confirmation means alot.