Go to Amazon and key in shading window film. It is plastic on a roll that you can apply to windows to block the sun.I really need to get something on the big door opposite the tank. The glare and reflection is just too much! Not a fan of curtains cause of my dust allergies but seems to be the cheapest option. I wanted one of those blackout electric shades, but at 3k my husband NOOOO WAY! I will have to do some more searching.