To answer the breeding tank setup question. I keep the adults in a 30 gallon tank. 36" (92cm) long, 18" (46cm) wide and 13" (33cm) deep. This is the tank they spawn in.
Originally, I kept them in my 55gal. But when I converted that to salt, I moved them to their own tank. I wanted to put them in a 40gal breeder tank, but none were available around me at the time. Breeder tanks tend to be wider and shallow, compared to your average display tank. The depth of the tank is really not as important, just as long as they have a lot of latteral space. Also, a good cover is a necessity. They willl jump when spawning and the shallow tank increases the risk of them jumping out.