High levels of nitrates, phosphates and nutrients in aquarium but without measuring them

We often measure nutrients in our aquarium and find them unusually low, if not even absent, and still have algae. Why? Articolo anche in italiano

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What kind of aquarium set ups don't need water changes? At least, very infrequent water changes. - Quora

Folks, what am I doing wrong? I got 2y old nano reef tank 65l/15 gallon, with nitrates and phosphates near 0, weekly 20% water change and still blooming hair algae on the

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