Join Date: May 2011
Location: Elk Grove, California
The plastic ones mostly. But some people buy really big fancy tanks that have specially made wooden decorative ones. Very expensive.
If you can find a sheet of plexiglass or plastic, you can cut it to fit your tank, cut out holes for your filter etc. and then get a fluorescent light strip to put over it. You may need to raise the light strip up so it's not resting directly on the plastic. As long as your tank isn't rimless, it should fit on there.