I've (hopefully) now finally posted my own video of how I made my 3D background for my aquarium and linked it through a nerw post on the forum here....
Finally, as promised please enjoy my video showing how to make a budget 3D rock wall background for your aquarium. Considering that a moderate sized background might cost you around £300+ ($450), I think this is a great option, plus the benefit that you can design it to include whatever...