Need ID help

My live rock came with about 50 of these polyps.

I've been calling them cup corals, because of this:

http://www.tampabaysaltwater.com/thepackage/id_images/db_1_cupcoral_-dsp_large.jpg

But they don't look like the pictures of cup corals I see posted elsewhere.

I was hoping someone out there knew the scientific name of these guys and any tips for their husbandry. I spent an hour clicking on the photos at saltcorner, which was a great reference, but I didn't see an exact match, although some of the torch corals look similar. I've read that clear tentacled corals don't have light requirements, but do need a lot of food. Should I be target feeding these guys some spirulina brine shrimp (or something else) even though I don't have fish to clean up what they don't get? (tank is still cycling), or can they last for a couple of weeks with no feeding?

Thanks

 

anyone?

 

They are called Colangia, or phyllangia(hidden cup coral) and are members of the family Rhizanglidae!!! I have many of these in my tank and come on Florida/Caribbean live rock. They are ahermatypic and often aposymbiotic! They come from the Pacific or Atlantic and are normally encrusting!

 

Phyllangia americana

 

Sweet, thanks guys I appreciate your help.

So since they don't need light (ahermatipic) what are their feeding requirements? Can they go a couple of weeks w/o any direct feedings? I'd love to keep them alive as my tank cycles, but I don't want the excess food to cause my tank to go sideways!

Also what are they Aposymbiotic with?

 

Don't contain zooxanthellae , therefore their reliance on light is insignificant, similar to Tubastrea!

 

Nothing? From Wikipedia:

Aposymbiosis occurs when symbiotic organisms live apart from one another (for example, a clownfish living independently of an anemone). Studies have shown that the lifecycles of both the host and the symbiote are affected in some way, usually negative, and that for obligate symbiosis the effects can be drastic.[1]

 

you should know better then to quote wikipedia, hahaha!

 

Sounds like getting divorced.