You'll want to raise fry in a separate tank, most folks just breed the pair in it. I used 20 longs, but have since learned that a 5.5 works great. If you put a flowerpot or such in the tank, that will be easy enough to move to the rearing tank (if they lay on it). They may eat the eggs the first try. Have brine shrimp eggs on hand.
Nothing good happens fast in an ecosystem.