I have a black ghost knife fish that seems to be doing very well, i have a couple of plastic tubes which he seems to like allot he swims between a 1" diameter and 2" diameter clear tubes. Im wondering what I should feed him? I have dried blood worms and I have had experience with frozen blood worms also. How and when should i feed this fish so he is able to eat, im afraid he never gets food since he is primarily on the bottom and the other fish get the food first. Also, ive read that these fish can be trained to swim in, and eat out of, a human hand. Im wondering how this can be done???