can i put them back on 18?

Hi there i put my plants on 12/12 for sexing i have a few white hairs can i put them back on 18 hours to make them abit bigger? Or should i leave them on 12? Thanks

You shouldn't have done this, if you want them to re-veg put them back on 18 but it's going to take about 2 - 3 weeks of 18 to get them back into veg in which time you could be half way through flower

^^^^ I agree. You don't have to put your plants in 12/12 to sex them, they will show pre-flowers at 4-5 weeks veg.

Always clone to sex mate,what you should have done is let them grow then took clones of and once rooted put on 12/12 off but kept away from the big plants.They would have shown there sex in a few weeks then while you was waiting the others would have been growing and ready to flower by the time they was showing there sex.................................tyke......with them been of a female you might get away with it,if they had been femanised seeds it would have been a defo no no