Well, we've had a sun coral for about a week or so, and had barely seen any little yellow tentacles anywhere. Not even at night. Well, last night, I saw one kind of poking out a bit. But then tonight, BOOM! I thought last night was "open", boy was I wrong. It's so cool! I thought we got a bum coral or something and it was gonna die on us. Nope. Needless to say my mom and I are happy people. Pics will definitely be posted tomorrow.