Hi all. I have been toying with the idea of banking up the sand substrate in my tank using filter bags filled with gravel underneath. I was wondering if anyone has tried this with bottom dwellers, especially corydoras. Is it possible to maintain a bit of a slope over time, or is it a totally hopeless cause? I assume a steeper slope will be more prone to sliding than a more gentle one. My sand is quite fine grain, 0,2 - 0,7 mm I think off the top of my head.