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I've found it works different with different tanks. In a planted twenty, I did divide it with gravel and fluorite in one area and sand in the other end. Turned out okay there with the small fish I had. They did not move the sand much. In larger tanks where I have used all- purpose or play sand which has many different size particles, I found I got different results. Over time the vacing sucks the small fine stuff up and tends to send it down the drain. As this happens the ratio of large to small particles begins to change the appearance of the bottom. For the fish , we may be over thinking the problem in many cases. There are some real sand sifters who might need/want fine sand but in general, I believe they will go with what they find without any stress.
 
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