hi guys first grow for me, into my forth week and since the 2nd week i started to get a yellow leave problem i would say 20-30% of the leaves have this yellowy look to them and some have started to die at the ends and around the edges. i went to the local grow shop they told me to buy a digital ph meter to get a better reading! best buy yet!. my ph is between 5.8-6 but try to keep at six as the guy told me. the problem has not gone away i have only been putting in nutes that the table tells me 20-30ml of cocco a and b per 10l. anyway took some cuttins some had slight yellow leaves put them in a propegator with just wather at ph 6 and the yellowy colour on the leaves have nearly gone!???. do u think i should just us water for a bit in my main grow to leaves turn to normal or half the dose ive bin using???? any ideas???