33L, this was after initial setup and a solid base line for my plans for the tank. Also right after putting in the rock poster in the back. Those are so hard to put in when the tank is installed and everything running already. Ended up with a bunch of bubbles. I kinda like it, at some angles it the bubbles turn into mirrors creating a strange looking background. Just for me so doesn't have to be perfect, plus I learned to never set up a tank that doesn't have a background if you are planning to put in a backgroung.