Gary, My son has Apisto Cacatuoides. The male is about 1.5 inches and the female is 1 inch. The other fish that are separated by a divider are 4 small catfish, 4 medium angle fish, 4 sword tails, and an algae eater. They are in a 30 gal. takn with and external filter. The heater keeps the water temp. at about 76 degrees. Should we keep it dart or well lighted? Thanks, Jon and Dad