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here are a few suppliers for grow lights that i use www.growell.co.uk - very big company fast shipping www. progrow.co.uk - small company handy for certian items www.norfolklights.com - my local and favoured supplier, i was in last week and picked up a 600w hps with ballast and...

looks like a zinc dificiency, flush the plant with a diluted nute mix contaning zinc, iron and manganese elements. also calibrate your PH meter as this could have caused your problem. DTM

off the top of my head i would say its the start of a phosphorus dificiency, plant use the higest level of phosphorus during germination, cloning and flowering. i would also calibrate your PH meter. Dan

try checking the underside of the leafs for spider mite, pics would be handy

tested my PH pen today it was 0.4 out, not much but enough to start problems. jahtrip, thanks for the info, i used terra pro on my last grow with now problems, it seems now i am using canna nutes it does not do it justice

i to did think it was a p.h issue, PH pen was last calibrated 8 weeks ago.

About half my plant have the problem pictured below, it started at the bottom and working its way up it been there for a week now. I have 30 plants 3 weeks into veg growing in 10L pots with terra pro soil under 6x 600 watt lights, feeding them canna vega and hygrozyme, PH is 5.8 temps are 84f...