Has anyone researched iodine deficiency's in the veggies of an aquaponics system and how to resolve the problem. With so many people in our country with thyroid problems and iodine deficiency's the main problem (along with non-fermented soy) how have any of you tackled this issue. We don't use refined table salt because of the health concerns there. Kelp is high in iodine. Do you feed your fish k…