[header] How to breed convict cichlids [title] Select the breeding aquarium. [step] Buy a semi-large fish tank, at least 20 gallons (75.7 l). A 30-gallon tank is ideal for one pair of breeding convicts. 
If you have the space, a 40-gallon breeder tank is ideal, especially if you're planning to breed more than one pair of convict cichlids. [substeps] Make sure that you don't exceed more than one breeding pair per 20 gallons (75.7 l) of water.