Do this.
 
If you have a medium to large tank this should work great.
 
You'll need:
 
2 Packs of Aspen about 3000 cubic inches worth.
4 Manila Folders.
2 (12") Wood Ladders.
 
*Use the Kaytee brand of Aspen bedding only. Other products are cut into 'splinters'
*and are not soft shavings like the Kaytee brand. Get them at Petsmart.com.
 
Take manila folders, cut them in half and quarters. Make paper tubes from them.
*Roll them up, insert finger and 'wind' them up from the inside to make the curl
*tight then when released they should unwind and set into nice smooth sized tubes.
*When finished, you should have about twelve 9" long tubes. And two 12" tubes.
*Manila Folder Tube idea from The Snooty Agouti ;-)
 
Place larger 12" tubes; 1 lying along the middle back-side and 1 along the middle
front side.
 
Now place about 4" of Aspen evenly onto the tank floor, covering the 2 tubes.
 
Fun part. Take all the other small tubes, and place them randomly around on top of
the Aspen. Insert some 'into' the ground at an angle. Place some crossed lying on-top
of each other. Some lying flat.
 
Now take 1 ladder. Place one 2 inches away from the left side of the tank glass, with
its bottom 'feet' inserted into the aspen, and the top 'feet' resting at a 45 degree angle
to the back-side of the tank glass. So the front should be on the floor and to the front,
and the top should be 6 inches above the bedding and to the back.
 
Do the same to the opposite side of the tank, except reverse the front-back placement.
Make sure it's 2 inches from the left and right sides. They can build a tunnel along the sides
between the ladders too.
 
Now put the rest of the aspen on top of the entire structure, shake some into and behind
the ladders. Don't place any into tubes that are sticking out.
 
Now importantly, pack all the aspen down until its firmed up a bit.
 
You should have a structure that's about 9" high.
 
Introduce the gerbils and let them goto work.
 
Come back in 6 hours.
 
They will have dug everything down below into a chamber maze, and everything on top
should be gerbil terraformed into hills and valleys. They'll be very tired-out to-boot!
 
After a few more hours things will be settled down enough where you can place a bowl
of food into a corner along with the water bottle (you may need to position it away from
any hills) as well as their toys and tissue paper they will tear up and bring below for nesting.
 
Behavior changes;
 
Compulsive digging will have stopped.
Gerbils may start acting 'out-of' captivity, and be more likely to exhibit natural instincts and
escape down below more often. No problem here, you can unveil the chambers and
observe them like I have done by removing a cardboard background I have taped onto the
outside glass sides for privacy.
 
Enjoy.
 
Me

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