Actually I have had them pair and lay in a 150g community but always sold them then, at the time they were harder to get o I got a premium price on mated pairs. You can keep a mating pair in as little as a standard 55g, (48"x12 1/2"x 21"), keep it warm (mid 80s), a little acidic (6.0-6.5 pH), and fairly soft (less than 6 dH). Feed then a good flake or small granule along with lots of live foods (black worms, tubifex worms, small earth worms, brine and fairy shrimp, young scuds, mosquito larvae, and very small crickets are all good choices, especially if you vary it a lot. They should go from 1-1 1/2" to around 6" long in less than 6 months and they will start pairing off around then. The tank should be planted and contain slate or tiles for egg depositing. The broods a smaller than with scalares but that might be because mine were always first or second time breeders. The only problems I had with them was that they got territorial in the community tank near breeding time and they would sometimes eat small tetras. In the early 80s I would get $50-60 a pair at first breeding, more if I took it in credit, this was from a dealer, about twice that retail. The juvies cost me around $2 each from the same dealer.