I purchased 2 of these to use as betta fish tanks. They're heavy and the glass is thick and all one piece of glass. No seals to worry about cleaning and the size is perfect. They look great on my back desk area at work and I get a lot of compliments on them. The fish can see each other through the glass, so I had to put a piece of paper between them so they don't constantly go crazy. But it works just fine. I would definitely recommend these!