Since I've switched over to PFS I'm never going back to gravel again. I thought it was a little too light at first, but I added 20# of Tahatian Moon Sand to the 100# of PFS I had and it toned it down just enough that I really love how it looks now. As for how much you need is up to your preference on how deep of a bed you like but a 50# bag would be a good start, it's a lot easier to add more than to remove some.

