Green Fungia not opening

I had purchased a green fungia last week and now it is closed up. It was opening the first 4 days and now closes up during the day. I've noticed it open at night but want to know what's going on. My water parameters are correct and all my other corals looks fine. I had seen my flame angel nipping at the coral and wasn't sure it this was why? It was opening up really nice and full, now it's strunk down.
 
Just looked at the coral with the light off and the tentacles are out. Why would it go from opening during the day to being closed during the day? Makes me think it's my fish messing with it.
 
It's rocking now! :) My angel always picked at it. Once I got rid of the angel, it came out more and more each day. I recentely got an orange one as well and have been feeding once a week, they seem to enjoy the feedings. The orane one was more flat, after some feedings it's a lot bigger now and more filled out.
 
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