Glass rocks?

[sammiicastro]

I'm currently setting up a leopard gecko tank and using tile as the main substrate. The tile doesn't fill the whole tank though and I was thinkig about filling in the gaps with these colored glass rocks. I need opinions on what people think

 

[mecoat]

Don't see why not, although they may be a bit slippery for your leo, and if they move as he's walking might they damage (pinch) his toes?