algea, flat worm or corraline growth?

[Auryn]

SO I used to think this was corraline growth

then this morning i was reading id posts and came across one that sayd it might be a flat worm

 

these are the pics of the stuff in my nano

its growing pretty rapidly and i have a few bits on some other rock

it comes off the rock pretty easily with minimal effort

its a little redder in real life then in these pics

 

I kinda like so Id prefer not to get rid of it

but if its likely to styfle my shrooms, corraline growth, eat my pods or be harmful in some way id rather not have it in there

 

this is what i have

 

 

 

here something similar is labeled as "Lithothamnion (prolifera?), encrusting Coralline Red Algae. Here off of Queensland, Australia. "

its the 11th id down the page

http://www.wetwebmedia.com/redalgae.htm

 

In these posts you guys idd something similar as parasitic flatworms

http://nano-reef.com/forums/showthread.php...&threadid=54217

 

just hoping you can help me figure it ouy

thanks

[greatreef16]

Well whatever it is, it does have really odd edges, it looks like there is even a shadow under the edges. Are sure it's "growing", or could it be moving?

[Auryn]

im pretty sure its growing cause thres more plates of it than there was before and its expanding

useds to be on 1 rock now its on several

its got ondulated edges and spots in the middle that are a slightly lighter shade of red then the rest of the body

 

the edges however are the same color as the body

[reef hugger]

It's coralline algae.