I have a regular 75gallon tank that I had setup as a freshwater tank and took apart to upgrade from my 58gallon reef tank. I am looking for ideas/examples of how to drill and plumb the tank. Mostly interested in the number of holes, size of holes, and placement of holes. Not interested in big overflow boxes and probably just going to use some Durso standpipes with intake screens. It is a glass tank and will have to be drilled through the back as the bottom is tempered. I will be using two 3/4in. sea swirls for returns and possibly some fixed returns if I find some good examples.

Thanks in advance for you input! 8)

Chris