I have a 18" X 18" X 18" rimless cube and love the clean look of it. I do have one issue with it. For some reason my snails love to go cruising on the outside of the tank
I've seen some pretty sweet glass rims with beveled edges that are only 1 1/2" wide that could easily siliconed on the top like a eurobrace. I think that might discourage the snails a bit...