2 Things on my live rocks

On one of my live rock i have this white thing spread around the rock.. it looks like a sponge, but i am not sure if it is good or dangerous... Here is a picture:

http://i941.photobucket.com/albums/ad251/petmania/IMG_5959.jpg






On my other live rock I have this dark red thing growing all over the tank, but this seems to be the biggest piece.. here is a picture:

http://i941.photobucket.com/albums/ad251/petmania/IMG_5963.jpg

 

I have never seen that red one before. I had a similar growth to the top one at one time. It was in my 29g FOWLR. I'm not sure what it was but it dies withing a week or two. It looks somewhat like a carpet coral.

 

Is that fiji LR?

 

Yes its fiji live rock

 

I have the red stuff all over my rock. I forget what it is called, but i s harmless.

 

That "red stuff" is called Coraline algae and is very beneficial to your tank.

 

BTW, nice show tank, xmentalfan.

 

That is not coralline algae.

 

well the second pic is a colony of foramaniferans. spelling is probably wrong... (red tree forams) but the first pic, hmmmm..... what does it feel like? it lookks like dead skeleton of a used to be coral but its really hard to tell.

 

thats what i thought too for the first picture, it does look like the skeleton from a dead coral.
did you said that it is spreading? or has it been the same all the time?