dude absolutely no way. have you used roots before? if you did then you must of took a dump in it! Roots organic is absolute fucking gold, here's a list of everything in it that is great
coco fiber, peat moss, pumice, perlite, compost, mulch, bat guano, worm castings, kelp meal, fish bone meal, soybean meal, prilled rock phosphate, feather meal, greensand, leonardite, alfalfa meal, oyster shell flour and glacial rock dust! what other amendments would
you use? You wouldn't add shit because it doesn't need it! Roots will sustain your plants with plenty of food for at least a month no nutes are needed, I've done so and have had tremendous results! Yeah I'm a big fan of this soil haha. Fox farm is okay too though I've definitely used it in the past, and actually still do with seedlings haha. but mr. "unless you amend it" is completely wrong. Give a try!