What is this?

Hey there so I have two pictures here. I'm just not sure what the name of the coral is in one picture, and the other has me perplexed. It's not worms or anything but it's small white "strings" that are on one of my rocks like they're growing????

 

Sponge. And the coral looks like a Blastomusa. Try turning your actinic lighting off to take pics.

 

That's sponge? Does it just keep growing like that? Its kinda ugly.

And the coral I thought was a blastomussa, just because that's what I was told when I bought it with my tank, I have two different ones. The one in the pic has white with a green center.

 

Here is an image I found that is the same as my other. I can't get a pic of that because it's around the side of the tank.

In my picture above, it's the same as this essentially, but the outer rim is white and the inside is green.

 

You can try pulling it off the rocks if you don't like it.☺

 

I may have too. What do you think about the other? I hate to be dense I just really have wondered what it is.

 

It could also be a blastomussa as they come in many colors. Caulastrea look somewhat similar.

 

http://www.liveaquaria.com/product/prod_display.cfm?c=597 2856 454&pcatid=454

 

Your quest for knowledge leads me to beleive you are pretty far from dense.lol

 

No sir, I think it's for sure a blastomussa. I do have a couple lovely bunches of candy canes though.