What is this coral? Reminds me of a carnation but the tops are spikes (and they hurt if you accidentally touch one!). Any idea what it is?

i just got a neon green nepthea looked amazing when i bought it now it doesnt look to hot (2 days later) i just read online that it likes moderate light and high flow which it wasnt in either of those it was in low light low flow so i moved it up in the tank next to the power head but what i am...

I just picked up a nice Nepthea frag. They told told me how to attach it to a rock using toothpicks and rubber bands. I've never tried this before. Does this look right? Thanks.