Intersecting colliders with constraints

Hi, I'm just having an issue with colliders at a very small size which are intersecting each other at no velocity.

I set up a few cubes with scale 0.1 and froze the position on Z - rotation on XY (like there is no third dimension). My gravity is set to -0.81 so there is not much pressure on the cubes.

When testing the scene all colliders of the cubes will intersect (image attached).

Is there a way to prevent this behavior? I would need them to collide very clean, but sizing them up also affects other physical properties so thats not what I want.

@edit: solution found: http://answers.unity3d.com/questions/399064/prevent-collider-intersection.html