You might give it a try if the cons are at least as big as the guppies.
I learned the hard way that guppy fry will attack smaller fry. I had do clear a tank in a hurry and moved a 3 week old batch of sterbai fry into a larger tank with older sterbai fry and some week old guppies that I had rescued from my community tank.
If I hadn't caught them in the act of attacking the little corys, I might not have believed it. I had never thought that kind of thing could happen while they were so young.