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I don't know if window tint can be applied without using chemicals. That would be my deciding factor. I have seen some folks use frosted glass paint on their back side, and it looks good. If you can get window cheap and apply it without danger to your fish, then I don't see why not...
Thanks! It's just black limo tint! Put on with water using a spray bottle and then squigy the air bubbles out! No need for any chemicals making it 100%safe