These are very colorful, shiny rainbowfish. Mine are also a lot smaller than an average Melanotaneia, similar in size to the ‘dwarf neon’ M. praecox.
When I picked them up from Phil Kelsey, he pushed some plants aside in the top of the tank and showed my dozens of fry of different sizes coexisting with the adults. Either he feeds very generously, or this species is able to recognize and avoid their fry.
I spawned mine in the standard, lazy rainbowfish way: I kept two pair in a 10-gallon tank for a few weeks with a bit of moss and some java ferns, then removed the adults and waited. I didn’t get a very high yield: a dozen fry, two of whom had swim-bladder deficiencies and failed to grow properly.
The fry grew quickly and are already quite colorful (although small) after 60 days. I fed them baby brine shrimp daily, plus a flake food once or twice a week.
All in all these are a typical, nice-looking Melanotaneia; their small size makes them better suited for my small tanks than most.