First Living Soil Composition

I'd honestly say go for some known potting mixex. For example from biobizz, the grow mix, royal mix from plagron, or whatever else. If cost is your concern, you'll be better off getting one already mixed. If you want to mix your own, it will be cheaper in the long run, but will require a higher investment to begin with I reckon. Just make sure you put some light mix in the middle where the seedling will start to avoid burning it with nutes. By light mix I mean something that doesn't have too many nutrients in it. They don't really need all that much in the beggining.

I'm looking at Nebula Haze's guide for super soil, and she uses Ocean Forest -- I thought this was not actually organic soil. It seems like it'd do much better than happy frog as a base. I can get amendments, but Build A Soil wants like 300-600 dollars to start an actual living soil heap. Roots Organic looks good, but I hear it holds a bunch of water due to its peat content -- I am a coir fan over peat for this reason. Many of the soil amendments I'm looking at don't actually list their NPK, where I can try to not burn my plants. I don't even know that these amendments aren't meant for random outdoor soil and too hot to add to FFOF, happy frog, roots organic.