mystery little fry in my fry tank?

Hey guys just feeding my fry in my fry rank and what do I see with my little peepers is a fry, egg attached still. So just wondering what size a bn could possibly breed as the largest one in this tank are 5cm. Other option is this guy has some how traversed my tank system. Either up a drain from a tank below or made it through the sump and filet bag and then pump. Color me perplexed

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.