Cover my AOIs back wall, Any cool ideas?

[Reefer Reborn]

I have always been dissatisfied with the color of my Fluval M90s back wall. It looks to me like schedule 80 Gray but dull.
I was thinking of cutting a piece of black acrylic to the same dimensions and cover it.
Perhaps glue it to the existing or maybe just some nylon nuts and bolts or clamps at the top and let the sand hold it at the bottom.
Would .625 or .125 be best?
Any ideas to get rid of the drab grey color would be appreciated.
I will have to accomplish this while keeping livestock.

 

[shakacuz]

you can try @ReefEco back wall plates: https://www.reef2reef.com/ams/product-launch-coralwall.917/

 

[exnisstech]

Don't clean it and something will cover it.