What is this coral?

[smfish]

I found this coral in my LFS rubble tank a few months ago, and have no idea what it is. I plan to get rid of it because occasionally it puts out a mass of sweeper tentacles that kill anything it touches. So, I would like to know what it is and maybe an idea what it might be worth. Thanks much!

 

[jda]

Looks like hydnophora. If so, a nasty, nasty coral.

 

[smtank]

Yes, Hydnophora.

Sweepers tend to be flow directional, keeping prized corals down stream from a Hydnophora can be a mistake. Take it from someone that has made that mistake more than once. Sweepers can be very long as well.