Need recommendations on feeding tubastrea

[Rumika]

Hello there,

I have just purchased what I believe is a Tubastrea. The LFS said it was a sunflower coral. I believe it is the same thing. Now my question is how should I feed it? Do I need to feed each individual polyp and how should I go about doing that. How often should I feed it? I have spirulina enriched brine shrimp,mysis shrimp and I bought coralife invertebrate smorgasbord. Is there something better or will this work.
Can I also train it to open up during the day? When we first purchased it they all would open up, but this morning there was a few that looked like they didn't open.

Any suggestions would be greatly appreciated.

Thankx again

Rumika