Yep, I'm pretty sure you're correct. Looking at the picture and the video in the article they seem to be the same species. It says they can be aggressive but mine don't seem to be too aggressive-they are terrified of my red eye tetra. I don't think I'll be able to tell the gender of the fish, even looking at that guide it seems impossible unless they are breeding. That's strange, I haven't ever seen that fish around here either before now.