The more you feed him, the more he'll eat. And the more he'll grow! They grow very quickly on live food, but try to give him some things other than live food or you'll end up with a picky eater!! Try something like pellets in the morning, and fish in the evenings. And yes, if he doesn't eat them al before you turn out the lights, don't worry, he'll find them in the dark! I've gone to bed with a load of fish in the tank only to wake up the next day to 1 or 2 if any! Have fun!
Also, I don't know how much you are paying for guppies, but they sell rosy reds in the fish stores as well as small goldfish for like 12 cents each. When he get's bigger and eats the large fish as mine do, they can cost anywhere from 15-25 cents each!!
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Jen

[This message has been edited by Repunz (edited 10-13-2000).]