I started aloe hybrids from seed using the plastic bag method. Place the seedling tray inside a plastic bay 4 months ago. It's time to transfer them to individual pots. I took them out of the bag a week ago but many are turning brown? They were nice and green with white spoting and white spines on the edge of the leafs when I first took them out of the plastic bag. Sort of reminds me of when you slice an apple and then it turns brown? Please advise?