I just put in my 29 gal about 2 months ago. I didn't rinse it as well as I probably should have, but I filled a 5 gal bucket about 1/4 the way full with the Black Diamond, and rinsed it a few times, then scooped it into the tank. The tank was established and the fish didn't get all that upset by removing gravel and adding the sand. Most of the sand settled out right away, didn't make the water cloudy at all. I changed the pads in my HOB filter the next morning... Quick, easy, and easier to clean than the play sand that I've tried previously. I'm definitely going to use it in my 75, and future setups.