Hi, I've used 5 gal tanks for spawning cacatuoides, mc masteri, borelli, viejita, regani, and N. anomola. 10 gal tank for nijsseni' and pandurini. In the 5 gal, the sooner you remove the male the better, i've had males killed by the females once the fry are free swimming. The tank has 2 ceramic caves and java moss. I leave the fry with the female for 3-4 weeks, then move them to a 20 gal tank for grow out.