Ok...from experience.....
The breeder tank doesn't need to be massive, but it is better to have some height...24"x12"x18"high would do it...I have spawned Angels in smaller tanks tho!...make sure there is a big Amazon Sword in a corner (doesn't need to be real...plastic, silk or strips of slate etc will do)...light not too bright...make sure you have a good pair who have taken some interest in each other...be careful tho when they have layed their eggs, as any frights (ie. lights switched on, doors banging, faces and hands on tank, etc) could cause them to eat their spawn!!!