Welcome to AFN Flockshot. Since the M3 is 15-33-38 I think it would be way too hot for Auto's to start out. Most folks have better luck starting in something with no added nutes. You could try layering it so that the seedlings grow into it after a few weeks. Just my opinion
Welcome flockshot! A good seedling mix will work out great on top your mix. When you get up and running, do post a jopurnal. If you need any help, let me know! Best of luck and happy growing.
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