It's all over everything, an even milky film. It's not any streaks. My tank is brand new and water has been in it only two days. The first day looked awsome this morning look like it how your windows would fog up, but thicker.
I have wiped some off and it kinda looks like it might be the salt, some has settled in the bottom of the tank like if I were adding salt, I do not have a clue.