There are still maybe 2 larvae from Spawn #30 that haven’t settled.  The dice roll so far seems to be heavy towards Lightning offspring…but all told there are probably 10 fish or so that made it.
Spawn #31 simply didn’t work out.  The timers on the filtration worked flawlessly, but for some reason the eggs simply never hatched.  After a very small hatch on the 6th night, the eggs remained and nothing hatched on the 7th, and after the 8th night they still were there, and vanished at some point during the day.  I’m presuming they had died, not hatched.  I ultimately didn’t bother to start a run…clearly my problems with hatching are not necessarily due to my artificial incubation methodologies, but something more fundamental.