Red leaves growing

[POLARBEAR0871]

I have these red leaves growing on a piece of live rock they're interesting and ok they're harmless but what are they they make me curious sorry for the fuzzy picture couldn't get a good one they're really small

 

[Ljfdfireboy]

Not sure what they are but I had them speed in a tank of mine. Nothing would eat them. Took a lot of scrubbing with a tooth brush and manual plucking to get it out of the tank. They will grow into fairly large leafs and slightly thick too. They did look net but grew fast for me. My LFS had no name for it just some sort of macro algae. Never had them return. I'll be following along to see what others think.

Here is a PIC of what I had:

 

[POLARBEAR0871]

Thanks good to know someone else has had these before haha no one answered on my first post about it they look good but they're not grouped together