Rainbowfish are certainly up there when they mature. I will try and upload a video soon. Most of the rainbowfish I have are only Juveniles. You cant see it in the photos but there are many growing fry/young around 15-25mm in there.
Dont suppose you know if anyone that is offering some males at the moment?
Im based in the UK, I got my Arus from a guy in the Netherlands when his daughter was travelling to the UK. I know there are people on Rainbowfish.org who sell fish in the USA, but i dont know who has young at the moment.