hey man for indoor grows organic is a bit more complicated, it starts with the water add approx 5g of "active vegetable charcoal" ($9-20 the KG) per L of water and let it sit an hour or two before you water, you can add it to the soil too when you first till it. Other than that there's mollasses ($5 a gallon), add two pre-diluted tablespoons on "non-feed days". Folks mash up egg shells in their soil and such but what you can do at this stage is adding a chelation agent, like three tiny drops of handsoap or some microbial tea to get the existing soil nutrients broken down. For micronutes is still cal mag + silicate and rhiz, and the best is that in a micronutrient foliar spray. That's the simple truth I'm afraid. Hope this helps staying bio my bio friend ! 🚀