Hey mate!
As i use BioBizz nute's i can tell you right away that 2ml of BioGrow is not to be considered Babyfood anymore!
If it is for a autoflower i would say that is BigBoyFood!
In the Biobizz schedual you use 1ml for every liter of water with AllMix and 2ml with LightMix.
Don't know what soil you are using but anyway, i would start with somewhere between 0.5ml and 1ml.
Dont understand what the second Nute is you were referring to by "biobiz" if you can be more exact i can tell you what i think about..
🤔
Since the plants are so small i guess you are not talking about BioBloom nor Top max.. so you are most probably talking about BioHeaven or ActiVera right? Those two you can use in more abundance.. start with 1ml and go up until 2ml per liter of water..
Since i started using BioBizz Nutrients i've never used EC and PH pens, got them sitting in a drawer waiting for defloration 😂
Main rule is don't overdue it, it's better to go a bit lower then the chart indicates and prevent overdoses and build up's
Good luck 🍀 and happy growing
✌️