Purchasing New Fish

[ohbabyme]

I currently have a 20 gallon tank with one female gold dust molly, two adult and two adolescent crawdads. I am looking to add some new fish to the tank, preferably some the breed rapidly. I am definitely getting two more mollies, one male and one female, but I'm not sure what other fish breed as rapidly as mollies, other than guppies. Any thoughts or suggestions?

 

[LyndaB]

Are you aware that the crawdads will eat the fish?

 

[ohbabyme]

Yes, I am very aware. The reason I am looking for rapid breeders is the fry population is controlled by the crawdads, which they need for their diet. It sounds cruel, but I'd rather have the fry get eaten instead of the larger fish. Circle of life and all.