So I came up with an idea to make tunnels for my bgk since he likes caves so much. Hear me out and feel free to make suggestions before I mess up lol. I plan on taking 3-4 inch PVC pipe and cutting it in half lengthwise, heat it up with a torch and put some curves/bends - also using 45 degree pieces as well. Then I wanna use silicone and coat it and roll it in rocks and whatnot. ( what silicone is ok for tanks?) I figure I could do two tunnels halfway across length of tank one in front and on the otherside in the back so ill still have room for plants. I plan on full picture updates. Thoughts, ideas???