I don't feed my open brain directly, but usually some food will fall in it and the tentacles will begin to come out and mov it closer to the mouths. You can feed them directly small pieces of shrimp and cyclopeeze (what I feed my zoas) On the frgspawn is the polyp branching off or hanging off?? If it is hanging on by the flesh and not the stony part then you are experiencing polyp bailout. This usaually occurs when the coral is irritated. If the coral is splitting a new mouth will form a new skeleton that is attached to the main body.