i dought you NEED to tranplant but you could,they should be good in 3gal for awhile
p.s check out my grow in my signature my plant is in 2 1/2 gal and is much bigger than yours
probably wasnt a good idea to throw 319 plants on top of eachother in a trailer,deffinately gonna have too much moisture,im sure you'll have some to smoke with that many plants tho
start ur own thread instead of highjacking this one you'll probably get more answers,but my guess would be ur growing that plant in what looks like sewege and over/under watering
he's talking about cutting the fan leaves that are in the way of the lower nodes,i would try to just tuck them first or you can cut them if you want to get better light penetration but i would give a little bit to heal before going in to 12/12
wait till its dry and run 6 gallons just double it and you can get a good flush,you probably overwatered it already,you can get some perlite for better drainage too