Guppy population control!

[Siett88]

I have a 40 breeder that had just corys, so I added 2 male and 4 female guppy, because the tank was at eye level for my daughter, and what kid doesn't like babies? Fast forward 3 months and I have a full (I mean FULL) tank of guppies. The parents seem to have no interest in predating (the tank is well fed). Is there any fish that would pick off some here and there, but not decimate them? I had a thought that a few scarlet badis would be cool, but any suggestions would be appreciated.

[Dawn T]

I've had dwarf gouramis, blue gouramis, and bettas in community tanks to control livebearer populations. Worked for swordtails and platies, so should definitely work for guppies.

[Colu]

Rivulus killifish make great predators of guppy fry

 

[Matt_]

You may want to look at how many hiding spots there are for the fry and how well fed the fish are.  My betta does not eat enough guppy fry to attenuate the population in my heavily planted, well fed 65 gal tank.  I have also seen guppy parents hunt fry into the corners of the tank and eat them when there are less hiding spots and the parents are hungry.