09-14-2008, 11:34 PM
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I can't vouch for kribs and their ability to control your guppy fry population. I have some kribs, and sure they are interested in small live creatures (like fry) but they won't relentlessly hunt them like a true predator would.
If you're looking for a fish to help keep those guppies in check, you might want to look into getting a golden wonder killifish. I have a pair of them and they're absolutely the most predatory fish I own (so far, even moreso than my Jack Dempsey, but he still has some growing to do). I wouldn't trust full-grown golden wonders with even adult guppies, though, so you might want to put him in a larger community tank or even his own tank. You could comfortable house one in something as small as 5.5 gallons, and he *will* eat every last guppy small enough to fit in his mouth that you add to the tank.
As far as the krib not eating...how long have you had him? Mine took a while to adjust before they were comfortable in the tank, as they can be somewhat shy, especially when they're younger. Even my adults are pretty shy about coming to the surface for food, and they aren't *huge* fans of flake, although they could get by on it. They seem to really enjoy frozen brine, frozen bloodworms and live blackworms. They also seem to like Wardley's Tropical Sinking Crumbles more than flake food. They can also go for a loooooooong time with little to no food at all. My female spends weeks not eating anything when she lays eggs and raises her fry.