new grower need lots of help

well hello everyone I Have just recieved my first plant from a friend that up until 2 weeks ago was growing outside and doing very well we transplanted it into a 5 gallon pail in soil and pete. He kept it at his house under a 400 watt mh.on a 18/6 hour lighting When I recieved it along came the light with it I have kept everything the same. I was almost set to start the flowering stage when the plant almost went into shock or something the leaves curled down and the stem began to turn very red I tried 20-20-20 fertilizer but to no success. The soil PH is 6.5. Right now I have it on the same 18/6 lighting until I get it healthy enough to flower. Please Somebody Help Me! also do i cut the dead leaves off is it killing the plant

Whats the watering cycle? What nutes are you giving it? Temperature of the room? Ventilation?

take off the dead leaves no use for them now, also its hard to tell wut ur defiency is but could be nitrogen or calcium , what you have to do now is click the grow faq link at the top of this site next to my roll it up and look under plant problems and click on the defiency chart they have , compare your problem with the ones described in the thread and take the following actions that they provide, simple 1, 2 ,3 will probably take you only a few days to get your plants back on their feet.

It could be almost anything even transplant shock. I would try flushing the soil then add a little b1. If the leaves are dead a little tug is all it takes to remove them.

You know you get better suggestions with a pic.