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Re: green water


One reason you probably can't test any nitrates or phosphates in the
green water is that they are in the biomass of the algae. The algae are
continuously being consumed and the nutrients recycled. What you want to
happen is for the nutrients to become locked up in the macrophytes, the

This is also why, if there aren't sources of nutrients (ie decomposing
material), then flocullating and filtering the algae is a good way to
remove those nutrients from the system! Better than shutting off the
light because that kills the algae but doesn't remove the nutrients. The
plants, even in the dark, are still dutifully absorbing nutrients.