Even with 1" of fine grain sand, it can get bad. I've got snails that like to bury themselves and an Amano shrimp to help keep it clean, though. A little white gravel is also mixed into the sand, so it helps... I think.
I don't think I'll be buying the new sand though. My hairgrass already has tiny enough roots... The not-so-fine-but-still-really-small gravel didn't work for it, I doubt this similarly sized sand will work.
But hey, whatever works for each person.