I am guessing that what you call zoos are Zoogoneticus tequila. I have never kept those, I have yet to even find any around the clubs here. I have only been keeping some of the easier to find goodeids like Xenoophorus captivus, Xenotaenia resolanae, Xenotoca eiseni and similarly easy ones. For them an unheated planted tank and keep them well fed is all it takes to get tons of new fry. Lately the X resolanae tank has undergone a plant explosion that will force me to remove plants just so the resolanae have swimming room. I recently picked up some Skiffia lermae and the juvenile Characodons so I only have keeping experience with them so far, I expect no breeding for juveniles.