First let me say this is NOT sand, it's fine gravel. N that it is NOT pitch black as listed but also mixed with white gravel. In my case, however, the color is exactly what I wanted. I'm also okay with the fact that it's not real sand, because the "cloud of death" (as I call it lol) isn't that strong. With this substrate, fish can be used on the same day. However, he has to sit for most of the day. The photo I took is day 1 of the GRAVEL lol.
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