so when do u give up on a plant and chop it down in hopes to save any bud?

heres the roots on a terrible condition plant

according to the diagnosis link in the problem forum they seem to be deficent of potassium nitrogen phosphorous...but the tips are burnt like its nute burn and that happend when i upped it to 1200ppm

my res water stays kinda chilly prob 60 or so...could that be causeing it?

anyone see a issue with the root pic or my last question? thanks

The hard water was more than likely the cause of your poor nutrient uptake. 520ppm, bet all sorts of things were going on.....mix your R/O water with your tap water to about 125-150ppm. It will buffer ph better than straight R/O, should make for fewer adjustments between res changes...my 2 cents....