I let mine all breed willy nilly LOL! and I got amazing colors. I got 2 that look like rainbow trout. all the way down to the super long tails. a total rainbow effect. there beautiful.
Marv--i did not know that it is normal to have a throwback to wild size and coloration from time to time, but I have had it happen! I brought home a beautiful orange tail female who let loose a dozen fry or so a couple of weeks later. Two of them have developed into miniature guppies with black dots and orange dashes on their sides. It has been about three months, and they haven't gotten any larger. I wonder if that is what happened!!