Well in that case, I say if you have the cash, go for guaranteed safety, comfort, quality, and great look, all by choosing from the caribsea super naturals line. It is designer substrate. Each of their variety was designed to look like the real substrates from famous rivers and beaches around the world. All are inert, all are ray safe (even have a ray on the bags), and are gorgeous. I have crystal river, many have torpedo beach, others with others. There is a white fine sand one which might go up a filter but the others just sink basal down quick. You can see little samples on caribseas website.
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