i just saw on monday that my lfs had golden killies in with guppys and some other fish! is it ok for them to do that or will it kill the guppys and other fish in the tank with them?
Their mouths sure are big! Colin_BC said his late-killifish ate some of his tetras and flying foxes. I would expect the same with guppies. I've never kept them, though.
I know someone who has guppy's and a killifish. They get on just fine as long as there is enough space between them. I don't know about guppy babies though...fish-food methinks.