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Replying to @0xca0a and @home_assistant
I bought it myself! ;) You can backtrack to https://x.com/utopiah/status/1455636398028034050 or go through the different RT that retrace the process since then.
No fishes involved, would be cool but a lot more complex. Here I’m just relying on nutrients, cf https://extension.psu.edu/hydroponics-systems-nutrient-solution-programs-and-recipes
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