I put mine, which i bought a couple of weeks ago, and wasn't eating, in a small 1 gallon tank and filled it with food. it then really starteed to open up. after a few days of doing this, it opened up more and more. It's almot opening up fully. the advantage of this is that you can dump the water after and not worry about introducing too much nitrates.
I just fed them again. I need to get them used to my hand being around them.
My dendros and every other lps I feed lets me HAND FEED them the cyclo, and I syringe feed mysis. My dendros are right next to the sun polyps and have no qualms...and I recieved them the same day.
Hopefully they loose their shyness.
Just spray it with some cyclops, selcon or mysis juice (as tunicata has done) everyday to get it to open. Try doing this everday till the polyps start to come out. As they come out feed them mysis shrimp. I feed mine mysis, formula one flakes, cyclops (flakes and frozen), diced shrimp/squid. Give it a few weeks and it'll open up alot during the night and you can even train it to open during the day. Any pics? O and keep moderate flow on it also.