What to do when leaves turn yellow buy the tips

[project weed]

I just brought me a clone thats 3 weeks from blooming i have it in farm fox soil the degrees is 78 i have a 400 watts cfl well a 300 an a 100.but it turnin yellow on sum of the leaves an lookin like its die n what do i do

 

[Captain Kronic]

Are you giving it nutes in that new FF soil? Is the plant in question too close to the light? It would help immensely to have a picture of what is happening, then we would be better able to help you out w/specifics!
Good luck to you and welcome to 420 Mag forum!

 

[project weed]