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#19
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![]() Quote:
Rob, Don't remove all the sand at once! You are essentially removing a large portion of your bacterial colonization. If you remove it all at once you may cause unwanted issues, ie RTN-STN due to increases in Nitrate and Phosphate. You also need to consider adding more rock to your sump/refugium in order to replace the medium that the bacteria just lost. I run zeovit and biopellets so these two items make up for a lack of substrate... Ian |