Ended up working at a LFS as a side job to fund the hobby and looking to bring up their game a bit. Issue is the insane amount of algae growth in their tanks (fresh and salt). so dosing is not an option. They have a large windowed store front. Windows and fish tanks... yeah it gets bad. I already know tints wont do much and the owner does not want to black the windows out as he wants traffic to see there is a fish store and it is indeed open when dark out. I am looking into the perforated decals to kill a majority of the light while still allowing night traffic to see in-store lighting. Any and ALL ideas welcomed and appreciated!