Iron is an important nutrient, but is commonly deficient in aquaponics because it is only available in it's ferrous form. This ferrous form usually occurs in low pH and anaerobic conditions. Luckily, there's a work around in something called chelated iron. What does iron do? (1:17) Types of iron supplements (4:33) How to dose (7:11) Learn more: http://podcast.brightagrotech.com/episode-17/