Ease of maintance. Nothing over 20 inches tall…. Obviously taller people with longer arms can probably have a deeper tank. Also the tank has to be wider than it is tall as this will give visual depth and better scapes.
The only exceptions are nanos where column tanks and odd ball shapes are still easy to care for since they are small.
The only exceptions are nanos where column tanks and odd ball shapes are still easy to care for since they are small.