I start adding silica (Advanced Nutrients Rhino Skin) after I’ve got them into the screen and don’t plan on much more plant manipulation, pretty much with first bloom nutes as I don’t do much with them after starting flowering. I’m not much a screen artist though, for me it’s just something I use to separate and support the top heavy colas so I don’t have to tie them up to keep them from falling over in late flowering. I don’t mess with soil amendments, the AN nutes has everything my plants could want and need.