I have the same ones. I bought them from an LFS as a 4 polyp frag and now it's about 15 polyps. I just keep them separated on a rock and my clown seems to enjoy hosting them.Under blues, they *kinda* look like mohawk palys/zoas, but I can't give you an ID. I accepted them to be generic brown palys. As for the last pic, it does look like a stretching yuma (but no guarantees)!
I think taxiem might be correct. This look pretty close to what they look like. There is no green in them and just look brown under the white but under just blue there is a slight iridescence in the middle like the pictures of the reverse space monsters.
If you look close it looks like the Yuma had a tiny baby at its base. I need to get the Yuma off this rock and into some more light.