Aqua Man
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Pics of roots? Yeah they sound hungry but let's get the base figured out. It could have simply been they were not uptaking enough water since calcium is passively uptaken.Also i changed res yesterday and let each of them sit in plain ph water for a little bit and gave them about 550 ppms and they have already dropped 100 - 150 ppms does that mean i should give them more? Because that does seem like a lot to me
So take RO and add cal mag until you get 150 then add your nutrients and then ph down.
Now what was the total ppm you were feeding. Personally I think you may benefit from adding a bit of grow if you have it.