I did the day count, and by my estimate the night of the 15th, going into the 16th, was 6+ full days post spawn on Spawn #21. Looking at the nest, it seemed they were ready, and it also seemed that at least some were missing already (perhaps they hatched and were consumed?) I pulled the nest and set it up with a wooden airstone (yay!) in a BRT with 10 gallons of broodstock water. Turned out all the lights save one, which left just a little tinge of light to draw larvae away from the air flow. I have pictures, but given some tremendous time crunches I’m under, they’ll have to wait.
Most of Spawn #20 is through metamorphosis BTW…