I’m disagreeing with the statement fertilizing autos doesn’t differ from photos.
Yes, it is necessary to fertilize any plant well. But every plant and strain and species (ruderalis) often has different needs.
I run 70/30 coco/perlite often. I’d just shoot for 1/3 or half of recommended feeding schedule. I’m not familiar with hornet nutes tho. Some manufacturers like fox farms have insanely high feedings recommended around 3000 PPM, others are more realistic. I’d probably run that cal mag at closer to full strength tho. Good luck!