As I was tending to my alarmingly growing menagerie of seedlings, something else that needs to be emphasized - as critically important - came to mind. It is to keep an eye on things, monitor frequently. Especially for those people who are using the dense planting method, once those tightly packed seedlings get growing, they also get thirsty - especially once they get into some sun, and when it gets warm. This is not a method that will work well if you only check your plants a few times a week - I check my developing trays at least twice a day - morning and evening - and add afternoon as well (which Sue does if I am at work). Drying out seedlings (drooping, looking floppy and dry) will typically recover well when you get to watering them, but it is not something that I expect the seedlings will appreciate if it happens too often.
The flip side is true as well - let the surface dry out between waterings - otherwise you can get a bad round of damping off (especially if you don't use a sterile soil less mix)
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Craig
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