Hey so with the silica i think it's like any nutrient if you aren't careful it could cause a problem, like raising your ph. I think using it the whole grow is best though in small doses because it just makes for stronger more resilient plants. The humic and fulvic acids i would add also, if you ever look at any labels for bud finishing products like bud candy or things like that they're mostly comprised of these acids, vitamins and sugars. So definitely don't hesitate. Good luck with the flowering.✌️