Coral closing up when fed.

Hey guys. I just got a package of Reef Roids that I ordered, and I spot fed for the first time yesterday. I've read that they open up when fed, but my frags actually closed up (minus my yellow polyps) when I fed them.



Specifically my zoas and star polyps. I thought it might be because they were eating and their "mouths" were full, but I wanted some opinions.