Can you feed them like other LPS? I've never seen a site that says how, and mine doesn't seem to just want to grab food off of my fingers like the others I have do. Is there a trick to it, or is it like my LRS said "you don't have to target feed them. Really you can't since they don't have feeding tentacles." I'd assume that since they have definate mouths that there is some way to get them to accept food, right?