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Aquaponics Control

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Hey /diy/
Some friends and I have been making an aquaponic system using two 1000L ibc tanks similar to in pic with sligth differences like the growing area is divided into two areas a larger greenhouse encased area and smaller outdoor. We plan on growing edible trout within them and hopefully automating the entire system. being a computer engineering student I am left with the arduous task of making a control system.. What I hope to achieve is have it it monitor the waters nutritents add have some balancers and stuff that can be injected if e.g ph gets too high and control O2 levels flow etc if anyone has farmed fish before it would be great to know what sorts of things to keep an eye on and what sort of sensors I should use. Unfortunately I can't seem to find too much about. Any help with general advice would be greatly appreciated. budget is relatively cheap. Currently have an spare Raspberry Pi or a Pic 40 Micro that I can use