He is way more active in the tank, he use to just sit in the filter current and swim in place towards the back, now he is all over. I can't wait to see him with a female or two! He should then feel more safe.
I did finally find a place for him in the 20gal, now that I put all the swordtails back in the 29gal. So technically, I can keep Guppy Boy. Maybe I'll surprise her with some swordtail fry sometime in the future.