The below chart contains the standard sizes for a typical aquarium. The sizes are for the tank only.
Reef Ready or "drilled" tanks have holes drilled into the bottom of the tank which elminates the need for an external hang-on overflow box. The overflow(s) are built into the tank which drains the water into the sump from the tank itself. The surface water pours over the overflow, down the standpipe, through PVC plumbing, and then into the sump. The water is returned to the tank by means of a pump.
The location of the overflow(s) within the tank depends on the manufacturer. Atlantis Coral carries Aqueon and Marineland reef ready tanks. Below is a size chart for the standard tanks we sell. For more information or to purchase a tank see our online store.
Standard Sizes - Aqueon Reef Ready Tanks
Standard Sizes - Marineland Perfecto Tanks