That's for sure is a haddoni and that color morph is pretty common. My lfs usually have it in stock and it's that same dull green color with a very very slight hint of blue/purple on the rim depending on the angle you look at it.
Haddoni are sand dweller and it's best to dig a hole in the sand and bury its foot for quicker acclimation. They also prefer rocks around it. They don't like too much flow and definitely not direct flow. They don't require as much light as the other carpet anemone(gigantea). If you can keep LPS with your light, they'll do just fine.
It will eat a lot of your critters like snails, crabs, shrimps, etc. and a lot of your fish as well. That, I hope, you know at the very least.