I dont know sex of the Yellow.

I had a white and all of a sudden it was stuck to the filter last morning.

I really liked it too.
This is definitely just a show tank... something for me to oogle over and nothing more. Anything that happens to breed in there (like the Rusty, which was supposed to be a male) will just become fish food. I will make no attempt at keeping the fry.
Right now, I think I will just be looking for some more Yellow if something else doesnt come up that catches my eye.