Easiest way to create a 3D background for aquarium : r/Aquariums
Coloer Hardscape PU Foam 900ml - Shop Online at Jungle Aquatics – Jungle Aquatics Pet Superstore
The great stuff cave project part Deux ummmmm I mean 2 - YouTube | Expanding foam, Diy sprays, Diy fish tank
Touch n Foam Max-Fill Expanding Foam - Pond from Pond Planet Ltd UK
Coloer / ScapePro] Aquarium Scape Expanding Foam – Fins and Paws
Tried out a weird idea I had with my old tank, it's a cave made with spray- foam and lava rock. On top is a bunch of moss I literally just scrapped off