I don't know if this thread was continued elsewhere or just ended abruptly in December, as it seems to have.
Havoc, as I said, I don't know for sure where your grow stands now, but I thought it would be worth mentioning as I didn't see it in any of the prior posts and this thread came up in a search I did for watering:
I think the plants were over watered, but not in the usual sense. Every 3 days or so should be a conservative enough schedule for containers of that size - provided the growing medium is properly aerated.
From what I can tell from your pics (and I think you said as much above), that looks like straight MG potting soil out of the bag. If that's the case, I'd wager the farm that this was your culprit. Generally, premixed houseplant potting soil will be way too clay/compact for our baby girls and end up suffocating them as they struggle to form their beginning roots.
Most commonly recommended soil supplements in this regard are perlite, vermiculite, and sphagnum peat moss - alone or in conjunction with one another. These all have distinct properties; a little research on each will allow you to make a determination regarding your set up.