added more nutes to correct N deficiency... put on a better watering schedule... continues to not look good! stunted growth... leaves are still turning, getting crispy, and dying. what would you guys suggest?

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Kerby, your rockwool is black! You should get that covered. Had that happen to me and I got a bunch of fungus gnats. Not cool when they're stuck in your nugs! They don't taste right.

You need a tds tester so you know your ppm. You can't grow hydro without knowing exactly how much nutes you are using. If you had this you would know if you burned them or if you are deficient. Did the leaves start to yellow and burn at the tips and work its way down? Or did they get uniformly yellow all at once? If they started to yellow at the tips its probably burn and vice versa.

large fan leaves went first, drooping, turning a uniform yellow.. then spotting, then the spots turned brown and curling up...

thanks for noticing the black #$%^... we didnt know what it was.

try some sodium nitrate. its cheap and will soon let u know wheather its a nitrogen deficiency

If they turned uniform yellow all at once then its probably a deficiency of some sort...probably nitrogen.

its definitely coming back, new growth looks good. Thanks everyone. As for those fan leaves... they are kinda crispy... would you recommend removing them?

You need to buy a Nutrient reader so that you can check you salt levels.