I do have a lot of demasoni young in the 1/2 inch to 2 or 2.5 inch range. If you want a reproducing group of these, you need to set up a fairly large tank (30 gallon minimum, IMO) with a ton of hiding places. It is best to start out with a large number of young and grow them out. If you have lots of hiding places, you will see young fish in a few months (4 to 6 months). You can use rocks or wood or combinations of these for hiding places. I use PVC piping and elbows of various lengths and diameters which cover the bottom of the tank and some on top of those. I have a couple sponge filters and usually see the fry hanging around these sponges and close to a hiding place.
The males still fight each other and chase the females but no deaths probably because there are more hiding places than the number of fish, maybe like twice the number of hiding places as fish, of course, once you start getting young, more hiding places are needed.
PM me if you are interested in getting demasoni.