partial harvest question

so if i cut the main colla and put the res of the plant back under lights do i need to give them nutes agian?

Well you'll be flowering for another 2-3 weeks for the secondary harvest, so it depends on do you flush? How long do you flush for? Is the plant showing any signs of deficiencies.

Just use molasses as an energy source. Are your fan leaves all yellow are do they still have some green to them?