If you want to email me directly at lv.glaser@gmail.com I will send you a PDF aquaponics book. that is a help but limited..... It gave me a few things to consider. 

i'm still new to be much help. I have 25 tilapia and growing duckweed and azolla in a small 55 gal system. I have a 30' x 40' greenhouse bought and waiting for dry weather to grade and erect it. Then I plan to use a 13' x  42" intuit above ground pool for fish tank with 6  10'  x 14" baby pools ( walmart system ) for flood beds with 4" pipe with holes drilled for net pots. I will use my existing system for raising new born so they don't become fish food. You will need a fish dealers licence from TWRA #118 $51.00 They told me that if I use blue gill that I can't sell them for food?? only small ones for bate