Cobra heat pads...

[davo]

ah is there a gap between the bottom of the cage and what the cage sits on then with visions?

 

[dirtyblacksocks]

There are two divets built into the bottom of the tanks so that they can stack properly, other then that it's fairly flush - but since they're from molded plastic the edges are sort of rounded and I'm not entirely sure they sit flush against their surface as a result.