Apparently, aloe vera doesn't need much attention. I had given up on the seedlings I thought I killed. Just as I was about to throw the lot of 50 away, I noticed that they were starting to turn from purple to green again. It's possible that the light/water ratio was too high initially. So I've moved these to a lower light level in the bakers rack. I think I might keep the water level the same for all of them, to test 1 thing at a time.