Could whack some Platy’s and Guppies in there, both are smaller than Mollies.
We started with one small tank, then another, then a 125L one.
Some of the fish get cycled between tanks. Fry go in the small one, when bigger they go in the middle tank, then off to the fish-shop etc etc, there’s always a cycle of them on the go!!
Big tank houses the breeding Mollies (2 male, 4 female, all different colours), 7 Platy’s (3m, 4f), 2 Penguin Tetra’s, 4 Cherry Barbs, 2 Glass Catfish and an albino Bristlenose Plec.
Mid tank currently housing 6 dalmation mollies, small tank housing 20 orange / black spotted fry.