In that combo, yb is very hard to ID, at least from my experience. I have a bumble belly breeder female and the breeder I got her from couldn't confirm she had yb either, I had to prove her out through breeding. Even then, most of the babies that had 2-3 morphs were very difficult to ID if they had yb but a few of the single morph babies we were able to confirm the yb. Your probably going to have to label them as possible yb until they can be proven through breeding. Who knows though, maybe someone here knows how to positively ID them and if so I'd love to hear how.
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