I've never even had a problem with it, when having sand sifters in the tank. As of right now, I have 200 - 300 Nassarius Snails in my tank and we all know how those things dig...sometimes, I'll see them at the very bottom of the tank...under 4" of sand. I also have 3 - 4 medium to large hermits, who dig thru the sand constantly, with no problems.
I've heard of people, who use acrylic tanks, saying "well, I wont use silica sand cause it'll scratch the tank too easy"...any grain of sand will scratch an acrylic tank. Sure glass tanks will scratch, but not from some grains of sand.
Other say that since is silica based, it's jagged and not rounded grains, like aragonite. Another BS excuse...I've used the HD stuff with fish as delicate as Banded Cat Shark pups, who are VERY susceptible to stomach irritation from rough sand and NEVER had a problem. I've had friends use the same HD sand in their Sting Ray tanks...NEVER had a problem.
People can use what they want, but I'll never use anything but QuikCrete, when it's available.