a lot of times with natts, you don't have to do anything special, they just spawn after they become sexually mature. usually a nice big tank with excellent water quality is required and then a large volume water change using cooler water can spark breeding behavior.
natts are not sexually dimorphic, so sexing them before they spawn is impossible.
if you are planning on having a successful spawn, you need to be prepared well ahead of time with a proper set up for handling the fry, which will consist of at least one decent sized tank or multiple smaller tanks for holding the fry... you will need to have sponge filters for these tanks that have been running in your main tank a few weeks ahead of time to make sure that they have been seeded with bacteria.
once your natts have spawned and you are sure the eggs have been fertilized, fill the fry tank using water from the main tank, then transfer the eggs and the sponge filters over to the fry tank. you will have to maintain excellent water quality in the fry tanks and feed the fry baby brine shrimp... its good to experiment with hatching your own baby brine shrimp ahead of time so that you have the process down before you have fry. as they get bigger, you can switch over to a high quality flake food or small pieces of raw shrimp.
it requires a lot of time and effort if you want to end up successful, but after a few spawns, you should end up with a pretty large amount of baby natts from each spawn.
