I have just bought a secondhand 60"x24"x24" tank that looks fantastic except for a blue painted back. It came with some fish that I didn't have room for in my other tanks - so I had to set it up straight away - but plan to change things to a full planted ASAP. Any suggestions for a DIY background inside the tank that would be fish/plant safe?
I am happy to be quite 'creative' and would love something 3D useing safe plastics/resins/concrete type mixes and colouring agents.
Anyone with any experience or suggestions?