BLUE TONGUE SKINKS

Would like to throw a few questions out there....
Anyone tried Repashy for their BT's?

What is your favorite substrate? I've tried them all and don't like any.
Have severe dust allergies myself and my BT's get it in their eyes....anyone?
I keep both Northern and Indo species, so I realize there are different humidity requirements.
Just putting this out there for some feedback from the skink squad...

I've been using repashy calcium plus for my blueys for about a year, prior to that I never really supplemented as I only had outdoor blueys. Now I have babies in racks and have primarily fed every other day with repashy and they're HUGE! MY 3-month olds are older than some 4 or 5 months olds i've seen. I'm sure it has more to do with the frequency at which i fed, but just sharing my experience.

I use coco coir for substrate, dry where it needs to be and wet where it needs to be. It's great for burrowing. some say they don't like it sticking in bluey nostrils, but i keep my substrate mostly most so it doesn't get up there.

I've been using aspen shavings (not shredded) with no problem for the 3 yrs I've had my northern. I put in a few inches depth to allow for burrowing.