I'm currently working my butt off at work to scrape up some extra money so my wife will let me get a custom built cylindrical tank. I want to try and keep squid but I'm still working on how to get it built. I was thinking either 36" tall with a 48" diameter, 36" tall with a 60" diameter, or 24" tall with a 60" diameter. I'm going to have a circular overflow box in the center and two returns plumbed at the very bottom just a few inches from the outside wall and directly across from each other. I'm hoping that it will spiral the water up along the wall and keep the squid in the center. Any ideas or improvements anyone?