The plastic background is taped to the back of the aquarium, on the outside. Usually, the prints are two-sided. One side usually has a photo print, and the other side is usually a solid color, or a graduated blue. That way you can choose which side you want to be visible.
Freedom is the sure possession of those alone who have the courage to defend it. -Pericles
Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of Liberty -JFK