Not wrong at all! Although alot of people do it during the day I think to witness feeding reactions, and also to train certain corals to stay open in anticipation of feeding to witness their full expansion.
If a coral is willing to eat, then anytimes a good time In moderation of course
I feed mine during the day, they are too closed at night to eat. I also make sure my fish are good and full then feed the corals. My maroon even feeds the bubble for me. If yours is opening at night then feed it at night.