Tonight is the anticipated hatch night for spawn #14.  It’s a smaller clutch…probably only a few hundred eggs to hatch, and it might have partially hatched earlier in the day or even last night.  I set them up in the 10 gallon tank with blacked out sides, using 50% new water and 50% broodstock water.  The eggs were sanitized with hydrogen peroxide at a rate of 3 ml / 0.5 gallon for 10 minutes, after which they were removed and placed in the tank for hatching.  Lights on the broodstock system currently go out at 11:30 PM, but the room doesn’t reach its darkest point until 2 AM.
On an interesting side note, I may have discovered a contributing factor, if not the outright cuplrit, of the loss of all juveniles in spawn #12.  It turns out that the Ehiem heater in the tank was no longer sealed…I noticed it wasn’t working when I sanitized and cleaned the tank earlier this evening, and upon closer inspection there was moisture inside and the coils showed white discoloration (reaction with saltwater presumably).  Did this have an negative impact on the babies?  Possibly…at minimum it cold explain why metamorphosis appeared to take so long…the tank may have been running cooler (eg. 74-76) than I had wanted, and that delayed meta could explain why the babies failed to survive post meta.  Or not; it’s only one of many possible factors at play here.
So the tank has a new heater, and hopefully we get a good hatch tonight.