Ok. This is a small leather that came attached to one of the live rocks I got off of a guy last week who was tearing his system down. When I asked him what it was all he could tell me was that it was a green tree coral.
The stalk is a dark color with a hint of green in it.
__________________ Remember dont tap the glass, your fish will think you're an idiot-Anonymous mother
IMO, it would be very difficult to distinguish between Capnella and Nepthea, bot are genus of the Neptheidae family. Not real sure, a close up of the polyp, one branch and another pic when it is completely open would be helpful, maybe.
I'd say almost definitely capnella...especially with the hint of green. And the kind of wrinkled looking stalk looks very much like a capnella that just needs a little time in a good spot to really beef up. Is it kind of firm like a capnella?