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Testing depleted Aquasoil


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I've never had it tested, but I more so look at the type of algae growth. With a new aquasoil tank that isn't established I tend to get a rush of hair algae until I get the CO2 balance. Later when the soil becomes more depleted I start to see more of a cyano growth. It's been consistent for me for years and that's generally the sign I use to let me know it's time to swap substrate. 

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