Considering getting a "dragon eel" from Petsmart for my office tank. The are actually senegal bichirs. Quite small at the store - 3-4 inches long. What would I feed it at this size? I know when they get bigger then things like brine shrimp, small ghost shrimp, guppy (or other) fry, etc. and maybe even small feeders. But what about when they are this small?