It turned out that both the Nebula Percula pair and the Lightning X Lightning pair’s nests were due to hatch on the same night this past week…..6 days for the Lightnings, 8 days for the Percs.  I scrambled like crazy to get everything ready, pulled the tile from the Lightnings (and set it up with 5 gallons of broodstock water) and set up a Vossen larval trap for the Percs.
By morning…nothing.  Nothing on either front.  Later on in the day, all the Nebula percs had hatched…and promptly died…either smashed between the glass and the trap, or smashed on the screen of the trap (I may have had things turned up too high).  I saw ONE Lightning offspring swimming in the tub.  The next night, still nothing.  Next morning, eggs still looked good…but nothing.
I am kinda frustrated, but whatever.  I have mounds of patience.  The Nebula Percs spawned again on 3/26/2015, and the Lightning X Lightning pair threw down their 9th spawn on Friday, March 27th.