Whats wrong with my plants

Not sure what to do anymore stressing me out in coco fed once a day with green planets medione line 1 third strength 1.5 ml of calmag ro water water her is terrible and salt softened need help scared im going to lose these
 

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Can you change your source water? If your RO system is getting salty when was the last time a membrane change was done?
 
I fill 2 19 litre jugs at the store once every 2 weeks maybe it's in need of a cleaning at the store lol but not too sure I test the ph only really should I check the ec I guess and ppms I just assumed if I bought it from the dispenser it should be ok I go 1 third strength with medi one part with all the additives and full cal mag than ph am I doing that wrong I feed them 1.5 litres each a night which gives me about 400 ml of run off should I do less water and see what happenes I was just under the impression that you shouldn't let the top of coco dry out and it always is by next watering I could feed less more often but not sure on how much or how often sorry for so much info im just stumped as they were pretty nice a week ago
 
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