id also suggest you can always make more than one aquaponics system ---that way you can grow things in one PH or another PH independently of each other --as long as you keep them close enuff to the middle that the bacteria doesn't go belly up maybe do some of the small 55 gallon drum systems too test ideas on & do smaller scale killing of fish and plants while ya learn --instead of overbuilding a huge system ---not saying you have to start small just a suggestion ---my biggest suggestion though is this ....anything you can see you can build yourself