Organic isn't the issue, your Meijers tomatoes may not be carrying seed that will reproduce the same fruit as the one you gathered seed from. F1 seeds mean they come true from the parent ( if I remember right). You have a 50/50 chance of what you might have. Now if Meijers carries Heirloom tomatoes, those seeds stand a greater chance of being what you need to be growing. Organic in a tomato 🍅- well, they haven't been gene manipulated to be resistant to Roundup, so that isn't an issue. Organic is a growing method that I can't see affecting seeds anyway.
A brick of coco coir is maybe 5bucks and found in many stores and is 100% better than sand to start them in ( a brick dissolves into 2 gal of coir) mine in sand this year are struggling- the sand closes up and tightens around the seeds too much.
2nd washing of coir
See?
