Is This mag or cal def or both!

pretty sure this is one of these deficiencies someone please confirm.

first pic is best resolution

from the pictures it doesnt look like either.. possibly the beginning of salt build up

anyway to get a better picture

i am using reverse osmosis so there no salts or anything in the water.

it has not recieved any nutes either. and its in coco

well if youre using RO water then you def need calmag why havent you gave it nutes yet...im surprised its looks as good as it does..how old is that plant...so you need some N obviously

it looks to be in hydroton too? and cooc?

yeah half coco and half hydroton.. I have been delaying on nutes because my partner seems to think we have burnt our plants but we have barley fed them, he was doing 3 teaspoons for about 8 gallons which half dosage would be 8 teaspoons. I just hit it with half dose today and am going to pick up some calmag as soon as I can.. There is a few deficiencies i no i just needed to convince my partner that we arent burning the plant