yes, he (she?) is eating. But apparently not hungry enough to brave the strange structure *trap* he now finds in his neighborhood.
My fuge is a separate 8 gallon acryllic box. there's a pump in the sump that moves water into it, and a drilled hole near the top through which the water goes back into the sump. I leave the light on all the time now, but I could cut back if there were an occupant (besides the chaeto).