[sphelps]

Most standard tanks from builders have the sides on top. The other method is actually more of a DIY thing that some custom builders do as well. Professional builders will make sure the glass is flat and has enough silicone in the seam so the glass will not chip. For exceptionally large tanks above the standard you see more of the base within approach as the glass is thicker and heavier but these will also come with specific requirements regarding supporting the entire tank area.

The reason why the "sides on top" method is used is it can be supported by the standard trim around the edges and doesn't require full support under the entire tank area. This works better with standard stands and eliminates the need for foam or other layers between the tank and stand. Despite what we all believe to be better practice, placing foam between a tank with trim and the stand is not required.