Target feed it by using a turkey baster to blow small amounts into the feeding tentacles in the evening. I would suggest feeding it after the daylight bulbs are out but the actinic bulbs are still on. Also keep in mind that it isn't even necessary to feed an open brain. As long as you have adequate lighting, it'll get all the energy it needs from your lighting. If you do choose to feed it, I wouldn't feed it very often. Ummm, no disrespect intended, but I'd suggest you read up on corals and study their needs before purchasing them next time...lol. But I also know how it is to see something in a tank that you just absolutely have to have...regardless of what you do or don't know about it. I'm guilty of the same thing at times.