Danged ol' party-pooper!The concept of acquaponics is interesting. However, plants CAN'T manufacturer minerals. Many people who build these systems are growing plants that are mineral deficient. Plants get their mineral content from the soil. If you are only feeding them i.e. the plants fish waste you have to find a way to get the plants the proper minerals.
Very few people are aware of this, nor are they knowledgeable in this type of growing environment. A plant can and will grow on the 3 basic components of fertilizer, however they will not be plants that will contain the necessary nutrition for human health and consumption.
Just food for thought!