What are these?

[Marcusa]

I would like to know what are these?

 

[mr_X]

the one on the right is a stony coral. small polyp scleractinian, or sps. it looks in pretty bad shape, but not dead.
the one on the left is a large polyp coral, but i'm not sure which. can you touch it, let the polyps retract, and then take a picture? how big is that frag? maybe a browned out galaxia coral, depending on the size. do you see any long sweeper tentacles at night?

 

[Sarcothelia]

Yea, the bottom one looks to be some sort of sickly sps. Possibly an acropora, in which case you should hand it over to someone with a well established sps tank because that thing looks close to the edge.

The top one is some sort of LPS, a more detailed pic would help . Could be a Galaxea like mr X said, but a pic with polyps retracted revealing the corallites would be definitive.

 

[Marcusa]

Yeah the sps is in bad shape, and just trying to get it to revive, a friend gave it to me and I was hoping to get it revived. The LPS looks green to me, I'll try to get a picture will the polyps in. I remember the guy at the LFS saying not to put it by any other coral because it will kill them.

 

[mr_X]

then maybe galaxia after all.they are green and do pack a potent sting to neighboring corals.