I've kept Boesemani for a great many years. My adult males max out at just over 4". I've never heard of the sizes mentioned above, but who knows? I can only refer to my own experience.Back to Neon Dwarfs then. I have a 60 gallon tank, but don't want my entire stocking to be rainbowfish. I looked at threadfins and the Gertrudae Rainbow, but they might be difficult for me to feed in a community tank. Any others I should be considering?