Please help me identify this

[alemap65]

I purchased a blue mushroom rock a while back, and recently have noticed the red frilly stuff has emerged from it. It grows quite fast. Is this a mushroom as well? or an evasive pest?

I tried to ask this on another website with no luck in getting help. Please help me identify this . Thank you.


<img src="http://216.77.188.54/coDataImages/p/Groups/34/34077/folders/214747/1702510big-tank.JPG" width="253" height="414">

 

[SeanT]

Looks like a macro algae.

 

[alemap65]

TY Sean. I am going to rip it out, the stuff grows so fast.

 

[EricHugo]

Agree. It is an alga.

 

[j1b1e1]

Scroll algae for those wondering.