About 1/2 of the hits to my personal site end up looking at the TV Tanks that I have up there. So what better DIY project to get this forum started out with.
Now I would not suggest this type of tank for saltwater unless your an experenced hobbiest as the smaller the saltwater tank the harder they are to keep stable. This concept is a perfect idea for freshwater as you can usually fit a prebuilt 20 gal
tank into most console TV's that are 25" or so in tube size.
You can find a description on how we did this on my site
Here are two images from another page
This one is a bit yellow as I did not use the flash. The fish a a bit blurry
This was prototype #1. We learned much in making this one that we then applied to prototype #2
I would be glad to answer any questions you might have about how to make your own.