Mine is very fine, it also sinks rather quickly but the air bubbler and the filter return and suction keeps a decent current circling and it can catch the particles. And suck them up.
Just sharing so you have a better idea. When I put in my sand, 2+ years ago, I had almost no info found to help me decide and in a FW
tank, no one I knew had ever had it for FW
. I tried to talk to lots of fish store people, although we don't have much selection. Never even new about sand blasting sand (SBS), and pool filter sand, and some one here even said the SBS comes in black.
That is why this place is so awesome!!