Im not to sure on how serious of a problem that would be as far as impaction.
But I use the bed-a-beast stuff and I love it. It stays moist for a long long time. My pacmen (plural form? haha) love it. Its so easy for them to burrow in and lets them feel real safe and moist.
Ive heard some say that keeping your substrate too moist will cause the frog to go to the bathroom in it and cause issues. But I have yet to experience that. I also change my substrate once a month as the bed-a-beast comes in a big block and I only use half a block to fill his tank.
-----
2.0 Ball Pythons
0.1 Leucistic Texas Rat
0.1 Kenyan Sand Boa
1.1 Bearded Dragons
0.0.1 Albino Ornate Pacman Frog
0.0.1 Ornate Pacman Frog
2.0 House Cats
And a partrige in a pear tree...
~!Bearded Dragon Custom Cage Design!~