Nutrient burn & irrigation.

Hi,im currently veggin my Big Buddah Cheese girls in 1oL of coco,they are around 6 inches tall,my EC is 14 PH 5.8 and i was watering with around a litre a day,they are showing nute burn on the upper leaves,my friend reckons im over watering and to use 2L every other day,i would be grateful if anyone has any consrtuctive comments on irrigation in coco and best ec levels for BBC.im using canna coca a&b,rhino and canazine,cheers.
 
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