Very good report! Cool that everything germinated so well and that you're nearing potting up time already. It would be interesting to hear the results of the magnesium/phosphorus if you decide you need to do it.
So far I've only started petunia seeds, a new experiment this year, tiny slow growers but doing well. This weekend I plan to start tomato and basil seeds and then toward the end of the month cucumbers and the main batch of annual flowers for the butterfly, bee, and hummingbird buffet. I think I'll try sowing some lettuce, spinach, and parsley outdoors in containers sometime soon, too.