After reading Chapter 7 and 12, I started find answers to my own question, like why would you prefer clay pebbles rather than gravel in the planting beds? What kind of plants do you needs to grow in and aquaponics system? What materials to use and where to find them them?
Chapter 7 mentions the requirements when it comes to small system to big system. I thought it was interesting you can figure out the size of grow beds and fish tanks from a one to one ratio it will eventually become a 1:2 once the system matures. This ratio also requires how much you feed the fish. If the the protein contents in feed increase then the waste in pounds a fish produces. The kind of fish is important to think about, Omnivorous fish has a lower protein compared to carnivorous fish.
Chapter 12 is mainly about plants. It mentions the unique ways of growing plants, starting plants, healthy plants, understanding pH levels and bug control. At first I really didn't understand what ph level was until I read the chart on page 165. pH level of 6.8-7.0 is recommend because its the most common nutrients deficiency in aquaponics. The planting beds recommend clay pebbles because gravel weight more than twice gravel does allowing less force on the plant bed structure.
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