New Grower Help not flowering

[Dubboy]

Hi, i have 6 think different autos on the go, there 50 days old, 3 are around 50cm tall and started to flower (all good) the other 3 are 80cm tall but havent started to flower, my lights are on 18/6, should i wait or turn to 12/12 to induce flowering? thanks

 

[namvet25]

Are they showing any preflower pistols?If not I would go 12/12 and see if that helps.

 

[Dubboy]

yeah theres slight movement at the tops, if i change to 12/12 can you change them back to 18/6 ?

 

[Marcuz]

I would go 12/12 and stick to it untill the end, im no expert but can auto`s go back to veg state like photos ?
Imo go 12/12 to the end