In my boxes of leftover materials, I have everything from eggcrate & screen to wood & pre-made great stuff pieces covered in silicone and bark. These are pieces that I never used or didn’t have room for in my tanks once completed. This makes planning for the next tank quite easy.
DIY Terrarium Tank used all existing materials
On my split tank, I bought barely anything for the tank. My uncle gave me the tank, hood & light for my birthday and most materials I found in my box of stuff.
What kind of supplies do you have leftover from previous builds?