Nepthea, Sinularia, and spaghetti Leathers?

[CP aquatic]

I was hoping you guys could help describe the difference between the three to me. From my understanding the darker of the green corals in my picture is a spaghetti leather and the lighter is green nepthea. At least that's how I purchased them as. Now I'm seeing Green Sinularia that looks very similar to both. Now I'm curious to know what I actually have...

 

[Mark9]

Good question, one I'd like to know the answer too.
I have what I think is a sinularia, wanted a nepthea.
You may want to ask in the soft corals forum as well.

 

[mussel and hate]

Nepthea is said to have non-retractile polyps. The gree branching leather coral sold to me as Nepthea has retractile polyps I'm guessing it's sinularia. You can test yours by ****ing it off.

 

[cloak]

I've always thought that a Nepthea was made out of a lot more Sclerites than that of a Sinularia, thus giving it more of an abrasive feel. Much like a Kenya tree coral. I have also heard that it has something to do with the polyps as well.