I’ve preached this for decades trying to get newbies to think outside of the script of the cannabis herd - cannabis is nothing more than a flowering FOLIAGE plant. In general it likes plenty of N, or you’ll get quite a bit of yellowing and a lot of premature foliar drop come mid to late flowering. Contrary to popular belief, this is not normal or smart, neither is “flushing”. It’s all a bunch of cannabis forum hype, paradigms, that just won’t die.
Also, cups are no go after about a week or two after your faves have popped the surface. I had a terrible algae problem and I know better. My very later seed starters, 2 Maui Wowie, were upcanned on Xmas day as juveniles with the typical single leaves. They have now caught up with the others in size.
My thread may have some tips fer ya. BTW, I’ve used all kinds of formulas of Peters, Dyna-Gro and Osmocote both for small productions and field productions involving acres. I usually buy in bulk, 50# at a time. I have never used any “cannabis specific” food. It’s a marketing joke.