I feed virtually 100% mysis every 2-3 days. I feed in the morning about an hour after my actinics come on. The coral stays open most of the day, as long as my shrimp don't go looking for a free meal. I've seen my peppermint shrimp going at the coral to make it close up, then grabbing the food from it's mouth. Not even during feeding but an hour or two later! That shrimp's days are numbered!