cheers for the reply .im running nft , at a constant e.c 1.80 and p.h 5.8 so that hasnt changed, i moved my light further away because i thought it might be some sort of burn . The problem is that it has been spreading across my plants , although most of my leaves are fine. I was going to use some tpye of pesticide today anyway just in case, do you think this is a good idea? Also im at week 5 of veg so can i use an inorganic type without createing more damage?