Really appreciate all your responses. jlinzmaier, the article is really helpful and informational.
Because there's some bubbles in the water flow from the refugium to the phosphate remover, I think to prevent more crumbs getting to the main tank, I should use the remover in a reactor.
The water is clear now and the amount of microalgae seems decreasing already. I'll keep an eye on my Alk, PH and calcium level.
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