Ok, thinking about pool filter sand for my big tank project since AS is just not going to work. But perhaps the money I'll save will let me do some other things I wanted to do. Anyhow, my question is how is the grain size of pool filter sand and how 'heavy' is it? Or actually any sand substrate, which sand would be the coarsest and heaviest? I think that would be the best combo for plants as well as loaches. The too light and fine stuff is going to turn into a dust storm with the fish on the bottom, and larger stuff like fluorite, well I just dont care for the look unless they released it in black, and the loaches prefer sand anyways. So can anyone recommend a sand that fits this bill?