I feed mine day or night. My LTA has a superb feeding response at night though! It will certainly eat with the lights on but is extra quick about it at night.
I occasionally like to give it a night feeding, because the clownfish are less active then and I don't have to worry about the clowns pulling the food out of the anemone and spitting it out in another part of the tank, as they like to do. Little jerks!
Mine eat anytime and take the food instantly. Strangely though my baby sebae has yet to accept food from me. I hear you though about the little clown thieves. I went to feed bohemoth last night and the grouper and the clowns kept yanking food away from my hand.
Thanks for your replies. I have had this sebae for about 2 weeks now. At first it wouldn't eat at all, but it seems to be very healthy. I have gotten it to eat a few small pieces of food. I just noticed that after the lights go out it gets extremely big. I was just assuming it was doing that to catch food. I may try to feed it tonight and see what response I get.