SPS Coral ID please?

[jnschlesinger]

I have had this for more than a year with virtually zero growth. I need to figure out what it is before I can figure out why it doesn't grow. All my water levels are optimum and everything else is growing rapidly. I'm at a loss, please help.

 

[Tahoe61]

Branching Hydnophora. It's sometimes called Horn Coral but it comes in a plating growth form as well.

 

[Sully]

Looks like hydnophora to me as well. I had a small piece identical to that.

 

[jnschlesinger]

Why do you think it not growing? It is on the top 2/3 of my aquascape under my G2 Radions with plenty of cross current and flow. CA 420 / KH 8.96 / Mag 1320 / Phos 0.02 / Nit <5

All other SPS, LPS and softies are flourishing.

 

[Tahoe61]

This coral is a very active eater, acting more like an LPS in that regard, so feed it. Introduce food, give the coral a while to show a feeding response than target feed it. An FYI, Hydnophora is one of the most aggressive corals I have ever owned, once it goes into attack mode the victim coral has to be moved or it will be dead. The stinging Mesenterial Filaments can get over a foot long in the right current.