Nate Storey has done it again!
nutrient imbalance is in my opinion the most difficult thing about
aquaponics. Nate really lays it out in an easy to understand method for
us to determine a course of action when our plants begin to look a bit
peeked. I would post the link to the KEY he has developed for
diagnosing these problems right here, but I feel that you should go to
Nate's site and find his offer. When asked to register just do it.
You will be pleasantly surprised.
Videos by Nate's
Below is another article that may interest you.
My Quest for Natural Macro and Micro-nutrients