They make excellent nano tanks,or if you don't want to many fish ,it's ideal for anemone,coral and critters,when you see one setup when you walk into the room it's a wow! Factor.
Had loads of friends and family round and always looked for the tank first,lol
I had a New Year's Eve party and about 25 guest round on the night,it was like a free for all to get a look and take pictures
They're easy and cheap to run ,don't take up any room because it's on the wall,quiet,and stunning.