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Originally Posted by Beverly
None of my tanks have sumps, fuges or skimmers, only mechanical filtration. I do have macroalgae in each tank that utilizes some of the nutrients. Crud is the source of nutrients, which, if not removed by some means, leads to all kinds of nitrate and phosphate related problems. By removing the crud, you reduce the number of problems you have to contend with over the longer term. I hope this simple explanation makes sense to you.
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I do have a skimmer and sump, and I still try to remove as much crud as I can, for exactly the reasons mentioned. Crud = pollution and should be removed.