How do I know if my tank’s too clean?

[Reef Builders]

Stand in your LFS and about one in ten reefers will say their tank is too clean. Compared to temperate and cold waters, the tropical waters that our corals inhabit are nutrient-poor, hence the symbiosis between photosynthetic corals and zooxanthellae, and the secondary food source. But can we really make our tanks so nutrient-poor that…
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