After watching many videos I have come up with a plan for my soil. I have organic planting soil which I have thoroughly sifted to remove anything that may decompose and create gas pockets. I plan on using red clay pucks and finely ground egg shells on the very bottom for iron and calcium. I also plan to mix a moderate amount of fine gravel into the soil to help with aeration. I also plan to mix a moderate amount of used coffee grounds for nitrogen, more egg shells for calcium and ground up, dried banana peels for potassium then cap it with fine river gravel. I haven't seen anything quite like this but it seems like a good plan to me. Any thoughts on this?