I am trying to develop my own guppy strains and (I know some of you won't agree with this) would like a small predatory fish to cull unwanted fish with. I have a spare 90 litre so the predator would need to be fairly on the small side. Seriously fish lists the African butterfly as suitable for a 80 litre, and iv'e always been interested in them, would they be able to take adult female guppies?, the site does say that in the wild they are more insect eaters than fish. Has to be capable of eating adults though as i'll obviously need to keep the majority of fry to allow them to grow out so i can see what colour they are. I was also thinking of the amazon leaf fish as it's slightly smaller than the ABF and from the seriously fish website it is said to only eat live fish, so i know it will eat the guppies but from a few quick google searches it seems to be quite fragile to any change in conditions, and i would prefer a hardy predator. Anyway iv'e rambled on enough any suggestions would great.