This is really up to you. They will breed just fine in a bare aquarium with any old filter. If I were you I would get 1-2 males per 5 or 6 females. Put some cover objects on the bottom (plastic plants for example) and you should be fine. It will take a while for you to build up any significant numbers. You might want to set up a second aquarium for juveniles just to get them out of the way of the adults while they grow.