I have a trio of breeders in a 30 long. I keep coral in all my tanks to maintain pH and facilitate swapping fish around between tanks. After I found a few BN fry that the chanchitos hadn't picked off I realized mine were spawning. A couple days later I moved the cichlid pair out to another tank to allow the BN's and some cichlid fry to grow out a bit. Since then I have moved 116 1" BN fry out of the 30, still have more than that remaining in the tank, and there's a fresh brood in the cave with the male due to come out any time now. I'd say they're very easy to breed, I wasn't even trying.