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I am running rdwc with advanced nutes gavita de and getting some dead spots and disclration any input helpful already cut back on nutes and added cal mag
Yeah there is a lot more info needed. It's best to fill out the form and then let folks have a look at that. You could also have a look in the joefresh sick plant thread. Lots of info in there.
I have found that most nutriant problems are directly related to ph. Not saying ph is your problem but that is something that needs to be ruled out at the least.