hrmmm, i have heard of fish breeding at that size, though it is uncommon.
that is prob more likely than it making its way through the system. I would have thought that the pressure changes through the pumps/plumbing would pop the yoke.
also that it is so young and roaming free could suggest an inexperienced father.
Doug's Bristlenose eBook -
The number one source of Bristlenose information and the most detailed breeding guide avaliable
3rd edition LOADS OF INFORMATION, PICS, DIAGRAMS AND BRISTLENOSE GOODNESS
GO TO www.keepingandbreedingbristlenose.com FOR YOUR COPY!!
Like my book - why not "Like" it on Facebook!
Click here to vote for Bristlenose World