its not a duncans coral. Duncans tentacles dont have inflated tips the the coral in your pic.
Will need close up pics to get a proper id, but from that pic it looks like a very interestingly colourd frogspawn.
Hi there
I also think its a torch coral/frogspawn. The centre is super luminous green and remains wide open approx 2-3cm in diameter with the tentacles on the outside. Unfortunately the camera cant pick up the fine stripes in the centre green section often appearing transparent,
Have thought of rescaping that part of the tank, but this coral is doing so well there that ive decided to leave it alone
Here is a more close up pic a few months back - the tentacle normally extend double than in the pic below
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Hi there
I dont do any particular target feeding for the bubble, he seems to be happy with what is in the tank. I do weekly feed cyclopeze at weekend and alternate with phytoplankton and zooplankton during the week
If he is not opening up, I suggest move him to a different spot. post a pic of your FTS and maybe I can offer a relocation
Looking at this pic, I too think its a frogspawn. I have one that looks the same, not as green as those though, will get a pic.
Must be the lighting cause my froggie looks like this:
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