No problem. You clearly knew what you were talking about, just trying to help out the OP. I could imagine an internet search and not being able to find anything about "black shirt tetras" haha. Also, as an interesting and possibly helpful side note. When I had black skirts they would faint when being netted. As in, when I went to net them they would go still, drop to the bottom, and then in a few seconds revive. It scared the crap out of me the first time, so it might be good to know before dealing with them. They are cool to watch. A nice shoaling fish.