Do you happen to know of any black bettas? I saw one at a petco about a year ago but haven't found another one since then
yes and no. this site has a good explanation http://www.bettysplendens.com/the-different-types-of-black.html
But if you saw a pure black at petco it probably actually wasnt pure black and would look a bit different once it colored up. Its possible, but it was more likely a dark blackish blue with blue iridescence, but the iridescence was faded out from stress. So when in a good tank it might be more like
Which I personally like better then the jet blacks.









