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Since the combined flow to the sump directly below the tank should be around 1200 GPH, would this be too much flow for a refugium housing only Chaetomorpha?

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Since the combined flow to the sump directly below the tank should be around 1200 GPH, would this be too much flow for a refugium housing only Chaetomorpha?

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I am considering a sump with no substrate because I have heard that the substrate can become a nitrate factory. This is confusing because I have also heard that Deep Sand Beds are denitrifiers. What are your thoughts regarding refugiums without substrates? My plan is that the Refugium and the skimmer would be the ONLY filtration in this tank. I thank you in advance for any help you can offer. Keep up the good work! Bart

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I am considering a sump with no substrate because I have heard that the substrate can become a nitrate factory. This is confusing because I have also heard that Deep Sand Beds are denitrifiers. What are your thoughts regarding refugiums without substrates? My plan is that the Refugium and the skimmer would be the ONLY filtration in this tank. I thank you in advance for any help you can offer. Keep up the good work! Bart

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