When to replace fish mix with bio grow? (im at preflower stage)

Hello

Im at the second day of preflower stage i run 3 autos from fastbuds mix pack outdoor in 10l fabric pots in light mix biobizz soil and i use diatomaceous earth.
About 2-3 waterings now i feed them with 0.5ml fish mix in 0.8l water each.

My question is when should i start feeding them with bio grow? Bio grow has molasses so its good for flowers. Should i wait for 1-2weeks to pass the stage of preflower / stretching and then use bio grow or should i start now or when buds start appears?

Thanks in advance..

You can feed Biobizz grow throughout but what I do is start feeding after 3 4 weeks because the soil has already enough food for the plant (all mix Biobizz). Look at the plant if you think it’s growing fast and drinking plenty I would go early with the feed and only start using bio bloom when I switch into flower

so what I do is add Biobizz grow,Calmag half the recommended amount and then see how the plant reacts to it and from there go up

I'm likely ourself let them feed on the soil for a while
I always have them in the final pots in 1 2 or 3 feeds before flowering id say I'd use it
They do like it I think in veg
It's a veg nute