HAVE A FEW question

1.I had my plants in a toxic growbox some for 2 weeks some for a month and some for 2.5 moths,didnt know what was the problem tryed everything till i found out that its the box,now their growing as u can see in the pics,my question is if they are hermie when am i gonna know it late in flower or as soon as they show sex couse on most i see preflowers now,2 days ago i started to flower,and is a plant more affected by stress and couse to hermie in veg. or flowering or is it the same

i also wanted ask advice from some of u with experience as this is my first time to flower indoors and these got a little bigger than i expected are 3 gallon pots enough for them to get through flowering /started yesterday/ and any advice on pruning leaves and LST is it too late now or can still prune them a little or is it better to tie bigger fan leaves that block the light