I wouldn't keep more than one pair in anything smaller than a 55. Sorting is the same as any pair-bonding substrate spawner, start with a group of juvies and swap off the extras after you have an established pair. Keep a close eye on them, and be prepared to move any individuals that need to be.
Tank setup requires hard, alkaline water, so crushed coral is helpful (as substrate or in a filter) for buffering. They do like sand, and a number of shells scattered around the tank to choose from. They don't care for their fry past the free-swimming stage; at that point they're on their own, and liable to be eaten soon after. If you use sand for a substrate a coarse grade like pool filter sand is better. If you use hob filters in a tank with sand make sure the intakes are either covered ot high enough that the fish won't "spit" sand close enough for it to reach the impellers.