nute burn

have problem My leafs are turning yellow from the outside in and i have tossed away 10 big fan leafs and it's working it's way up it's also turning the lower small leafs yellow then white my ph is 7.0 is this the problem, i heard from a friend that it needs Magnesium.Help i don't want to blow this.

milton weedly said:

have problem My leafs are turning yellow from the outside in and i have tossed away 10 big fan leafs and it's working it's way up it's also turning the lower small leafs yellow then white my ph is 7.0 is this the problem, i heard from a friend that it needs Magnesium.Help i don't want to blow this.

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How old are they, it's natural for the old lower leaves do die off after a couple off months. Your Ph should be lower that's for sure 'specially if your doing hydro. Then you have nutrient "lockout" not burn.