Sounds pretty stupid but I was wondering if anyone could give me any info on my new tank. 36lx23wx20t with 5 inches off the back separated for a built in filtration system. Its acrylic and has a nice cover built on and 2 lids with it. I'm not sure about the tube area in the back, Could it be for a built in skimmer ? or a heater chamber? I plan on using it for my first full marine tank if possible. Lemme know if you have any ideas about it - Or if you know who makes it -