So I know with some people wanting to hop into co2, a way to conceal the co2 tank can become an issue, especially if you don't have a cabinet under your aquarium. I found the following $15 vase at walmart, and with a few cuts, it perfectly fits a 5# tank. This is still a WIP, and the plant on top is just a placeholder, but it shows that the shelf I made is functional as well.
22" Vase
Here is a full shot, brightness from my light is screwing with the picture
Side view where I have some nails temporarily in to hold the shelf I made
More of a top down view
I used the piece I cut to allow clearance for the gauge to make a shelf to rest a plant or decoration on
Here is how it looks with the shelf installed