Autoflower Nutrient help

[420BPM]

Hi guys,
I have been growing Opium Auto and Black Jack Auto.
Its their third week after they sprout.
They have never become good goer. They never became happy as I never saw them reaching for light. Anyway,
Black Jack has entered pre flowering stage yesterday.
I use Biobizz light mix as medium have never given any supplements so far except for rhizotonic 4ml/l. Should I start giving them nutrients? ( I have Biobizz grow, bloom and sensi calmag at my hand.)
What do you think about their size ? Thankzzzzzzzz.

 

[bluter]

they look good.

biobizz is supposed to have enough for three wks or so. the hand off from soil nutes to bottle nutes is always dicey in that system til you get used to it. you have to watch the plants like a hawk.