I have a 240 gal. tank. I plan on having at least another 300 gal in sump behind a wall in the garage.
I would also like to be able to add more grow out room in the garage above the planned sump (potentially another 300 gal.)
I am building the largest skimmer I can so it can overskim if I need it to and keep up with the bio load if I ever add the extra sump.