Mystery HH- any ideas?

[DLANDINO]

Rarely am I stumped but here we are. I bought this piece if live rock to seed my dry pukani about 6 months ago. I saw that there was a tiny pin head sized something or other with tiny feeders. I was curious as to what it could be so I started to target feed it nightly. Flash forward to tonight. This is a pic of it eating cyclops. One thing is for sure, it's an LPS of some kind. It glows bright green under led moon lights and is perfectly round and looks like a button polyp when not in feed mode. Any ideas?

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[saltyair]

photo isn't clear - could be a type of fava

 

[mike nickerson]

Dendro? Or Sun coral?

 

[DLANDINO]

Neither a favia or a dendro.

 

[Hormigaquatica]

http://www.sms.si.edu/irlspec/Phylla_americ.htm