Proving out possible hets

After failing two years in a row with het x het breeding, decided to throw a RSYB possible het in with a couple of hypo females. I was hoping, at the very least, to have a 100% het I could use later. But the young guy did a masterful job. 9 out of 15 eggs contained a Hypo, including this boy. To my knowledge, he is a world’s first, Red Stripe Yellowbelly Hypo