After having two broods from my pigeon blood parents, one artificially raised and one naturally, I put them in tap water at nearly 500ppm to stop me getting overrun with babies. I've not paid a whole lot of attention to them since, just feeding them and a water change once a week.

They've still been spawning regularly but at that hardness the eggs have been infertile..... until a week or so ago, they're now parading around 40 young on their sides. An even bigger shock is that one is much bigger than the others so it looks like one survived from the previous spawning as well. There's no stopping this pair lol.