I fed my N. Copelanii a few frozen blood worms (thawed out in distilled water), and it seemed to like it. I also gave one to my D. Capensis, and one to the D. Roseanna, and there don't seem to be any ill effects. I'll have to look into the flake/pellet idea... it makes sense from a certain way of looking at it. Have you tried it?I actually just read on the terraforums that you can feed neps koi pellets/fish flakes. Since the koi pellets have such good stuff in it, the plants grow like crazy.