Do you thinks it is possible to keep a group of guppies into the aquarium with plenty of hide?

Having prey so close will the garters risk eating to much, eventually consumes them all and be overfed or might they just eat there needs and allow the fiches to breed?

I did that with my dragon, hopping he will delight on them, but he was never fond on fishing, so now the aquarium is full with these tiny fishes. By the way, I don't intend to put the guppies from my dragon tank to my garters tank, just to make sure I did not bring something undesirable with them.