6 gallon long backdrop

This is a pretty easy way to add a backdrop to your 6 gal long. Print 5 pieces and it should fit together nicely. It fits the sides as well, so you can do 6 7 if you want depending on if you want a side or two covered.

https://lifegardaquatics.com/products/6-gallon-long-45-degree-low-iron-ultra-clear-bookshelf-aquarium-39-92-x-5-90-x-7-87?variant=32685201326218&country=US&currency=USD

I got it from chewy, but the above link should work.