Ha! No just regular windows. Commercial window wall systems that seal to the building elements (plaster walls etc.) are water tested (a mock up and then a portion of the windows). Usually the test actually involves inducing negative pressure at the back side of the window. A spray bar is used on the exterior face and usually run for at least 20 minutes at a prescribed pressure. All this to test for potential leaks one might experience in a heavy storm. All the window seals and the sealant from the frame to the building need to pass the test. Window systems also weep water but this is not relevant to aquariums.
So if you want to totally seal something to hold water, then you are talking serious business! You don't want your hard work to fail the test (when you fill the tank)!
