How I Created My Faux Rock Wall Aquarium Background

A forum member asked me to show how I carved the slate like layers of my faux rock wall styrofoam aquarium background, so I finally did it. Here are a couple links to subsequent video updates to this wall: During painting:    • 75 Gallon US Native Stream Tank DIY Styrof...   Post Painting:    • DIY Styrofoam 3D Aquarium Background plus ...   Post Installation:    • DIY Styrofoam 3D Aquarium Background plus ...   Later with fish:    • U.S. Native Fish Stream Tank Potomac Drain...   Most recent video w/fish:    • Frisky Potomac River Satinfin Shiners!   Links and Materials: Aquarium Background Materials: -Foam boards used: Owens Corning FOAMULAR Project Panel, 2'x2'x1" https://www.homedepot.com/p/Owens-Cor... -Glue: Gorilla Glue Original Glue https://www.homedepot.com/p/Gorilla-8... -"Plastic Pegs" (actually cake pop sticks): plastic cake pops sticks Great Stuff Spray Foam to fill in gaps behind the wall: https://www.homedepot.com/p/GREAT-STU... -River Rocks (to reduce buoyancy stuffed in the gaps behind the wall then sealed with spray foam) Egg Crate Plastic Light Diffuser GE Silicone Caulk (no mold inhibitors) to glue structure to the aquarium glass Tools: Butcher's Knife Black Sharpie Wire Brush https://www.amazon.com/Stainless-Scra... Metal springs, sea shells, coral and other objects to push into the foam to create fossils Rapala Fillet Glove: https://www.amazon.com/Rapala-BPFGL-F... Utility Knife: https://www.amazon.com/TIFICAL-Snap-o... Kabob Skewers https://www.amazon.com/HOPELF-Natural... Paint Brushes, Sponges, to apply paint Paint stirring sticks Wall Finishing Materials: Drylok (Original, no mold inhibitors) Concrete and Masonry Waterproofer https://www.homedepot.com/p/DRYLOK-Or... Quikcrete Cement Dye in various colors https://www.amazon.com/Quikrete-1317-... Polygem clear coat Epoxy https://polygem.com/product/armorcoat...