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I love kuhli loaches, but many of my tanks are dirted and capped with gravel. Some gravels are especially course, such as eco-complete. I understand that kuhlis and other bottom feeding fish can get badly scraped up over time and even lose their barbels to gravel. I'd really rather not go through the massive ordeal that is replacing the substrate of a dirted tank, so I was wondering if adding a layer of leaf litter would make a difference or not.