I'm a novice and started out my tank with 4 mollies (2 silver, 2 black) - they've had fry and since eaten them (I think it was them, coz the only other fish i had in the tank were cardinal tetras).
I've recently put in 4 guppies and 2 gouramis (all male), but 2 fish have died (1 guppy, 1 tetra)...