LOL, you guys are hilarious. I always heard dogs could have a litter of 10 puppies from 10 males, but never heard of a baby having 2 daddies ... ok, I know, you said 2 POSSIBLE daddies. It's still funny.
My goldfish tend to be light colored when I first notice them, or black, usually at about 1" before I see them the first time. The light colored ones have white and orange and black markings on them, and the black ones are usually solid, but change to orange/red as they get older, sometimes within a few months, others by the following year. Good luck with your new babies!