I have not spent time to learn how to set HydroBuddy up and use it, but my initial impression is that it may be a good tool for adjusting nutrients. It's oriented toward hydroponics, but through the customization windows I believe it could be made to work with aquaponics and bioponics. Here's a link to HydroBuddy.
Daniel Fernandez has made HydroBuddy a fully open source program.
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