A little bit of calmag goes a long way.
I just reread the longer post, and it is too bad on the minicolliseum. It was a cool little idea... I can totally understand the labor being too much though. When you get those little plants flowering, they need so much attention, and practically twice daily waterings...
i let my tap sit out at least 36 hours , its fine
Congratulations on the successful seed run. Looks really good!