- This rock background comes in 2 sections (2 halves). If you have original Juwel internal filter in the corner, you should remove it if you want to install 3D background. We recommend any good external filter, in this case with thin background there no space behind the background to fit the filter pipes. The pipes have to be in front of the background. What you will get is 2 panels of background. Each panel dimensions are 66cm width by 51cm high. Thin background is only 10mm thick, and it’s almost flat on the back. Looking at the side you won’t see gaps between glass and background. It is recommended to silicone the thin background with a couple of silicone dots The space from glass to front of background in most points is less than 1cm. Background is made from poly-resin, which is safe for all aquatic life. Our backgrounds sink, it’s not a foam. Installation is very easy, you only have to slide it inside your aquarium and background will stay in place. The background is not flexible, you can’t bend it, but you may trim it by using angled grinder, hacksaw, dremmel The background colour is grey, but the video shows the structure of beige thin background We can do any size of background with drilled vents in desired placed. For custom built background please contact us or visit www.backgroundquote.co.uk PLEASE NOTE: main picture is only a sample image of this product. Item which You will receive may not be identical to the picture. Color may vary, can be slightly lighter or darker. It’s hand painted background and every item is unique.