ID Help please

[granpafish]

Live rock placed in new tank 3weeks ago. Tentacles retract and are clear.

 

[bang guy]

Can you describe this a little better? I see some tentacles on the far right that look like Hidden Cup Coral. Are those the tentacles I should be looking at?

 

[granpafish]

Yes they are tenacles on the bottom right. The same type thing is above but the tentacles are withdrawn. Here a close up of the top one.

 

[granpafish]

Sorry new to this. The size of the larger one is about 3/8". The tenacles are fairly clear with a lighter tip. There are numerous tenacles. They seem to stay out at random times some will be retracted others not. One more pic of the bottom ones. Thanks.

 

[bang guy]

OK, I'm thinking Astrangia sp. This is a stony coral that doesn't need light. It will need food though. Any meaty seafood bits will do if you want to keep it.

 

[granpafish]

Ok great, thanks. I was fearing Apatasia. I will look Astringia to see if I want to keep.