What are these???

[a&m aggie 04']

I have these 2 of these white roundish things growing on my rock. It looks pourous, kinda like a honeycomb. Any ideas??
Also i have what looks like plants growing out of my rock, looks like they have small leaves. Ill try and take pictures b/c there are probably millions of things that fit this bill.
But anyone that can help, please do.
Thanks,
Mark

 

[bang guy]

Honeycomb = Sponge = wild guess
The plant is definately an algae.... can you give me a little more to go on??
Cheers
Guy

 

[a&m aggie 04']

Heres one pic but not really good.

 

[a&m aggie 04']

heres another

 

[a&m aggie 04']

can anyone tell me what this one is too???

 

[bang guy]

Hmmm I still can't quite make out the algae.
I've seen that sponge before. I believe they can actually move. I'll try to look it up and get back to you.

 

[a&m aggie 04']

should i just pick off all the algae? What some of it looks like to me is the things that grow out of potatoes when they get a little old. Seems to be growing on quite a few rocks. Ill try and rip a bigger piece off and take a picture.

 

[nacl-h2o]

The algae is a type of sargassum. You don't have to remove it, in most tanks it grows for a little while and then dissapears. Some Sallys, most Emeralds, and many Tangs eat it.
The other just looks like a common brown sponge.
HTH

 

[a&m aggie 04']

okay sounds good, ill go get so emeralds this week. Will they be a problem with my peppermints?