Hi Judy! I am using a screen lid for a regular 10 gal that clamps shut as for the rest I just flipped my 10 gal up and cleaned it out, had to hot glue strips of my rubber matting to the liner of the open side so my screen lid would have a tighter fit then made a wall using a piece of drift wood so my soil wouldn't seep out on me when I opened the side door to change water n such. I am getting another 10 gal and going to take the bottom off and combine them, will be sealing them together.I found a detailed instruction taking aquariums apart. Here is the link to taking one apart.
How to Take Apart a Glass Aquarium | eHow.com