Watch the tank close! I had one that was 3.5 us gal. and it was great, until after several months went by and I was watching TV across from the tank and (pow) one side of the tank let lose and started to spew. This thing was intended to be a vase or something and I bought it at a second hand store and don't know the whole history but it looked like it would hold fish and water. That was enough for me.
I now buy or build real tanks. You never know how the the thing is put together and when it fails it's to late..
Is it sealed with silicone or is it just welded together with friction like mine was ?