k i read a bit more...... grout has a great point, To me it looks like lock out , of maybe the ph is locking out magnesium or other imobiles,due to what i guesse is high salini ty. most of the leaves are smallwich can be an inication of alot of nitrogen, and since you are using a complete food, this kinda means.... too much food, too much salt. this would be my guesse. I dont know blue widow, but in generall the more indica a strain is the less food it needs. they are squat dense bushes, not x-mas trees. It is safer to under feed than over, If you stayed at week 1 and only moved to weak 2 when they looked hungry, the may be playing it too safe but, you would be unlikely to over feed, Or maybee set an expeiamental limit for the ppm at week 4............... Some things you may want to look into... , table angle 3 degrees is ideal for NFT, i am not sure about rockwool. water temp, at what ppm is your ph perfect? <<<<<the more info you give the better peeps can help, water temp air temp humidity,etc. I do know that rockwool has the ability to hold nurients away from plants, certainly more then airoponics or hydroton, so a routine leaching, or straight water period would probably help until you nail that bitch! sorry if i am blabing shit you already know, hope it helps