Looked in my tank today and got to watch two of my watermelon barbs spawning. It was pretty cool. The dominant male is fairly aggressive, mainly towards his own species. He would chase the other fish around the tank relentlessly and appeared to try to 'herd' the ripe female to the spawning area in some dwarf hairgrass. They went around in circles for quite some time, with some obvious spawning occuring when she would get in the hairgrass. She also appeared to turn right around when they were done and eat the eggs, so I doubt there will be any fry, but its possible some will escape. Anyway, I hadn't watched barbs of any kind spawn before, so I'm pretty happy right now.