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I have some smaller rocks that I'd like to attach to each other to form a structure. I think cement would work but it's a bit of pain and messy. Does anyone have some easier methods?
you could try super glue gel or aquarium safe silicone. I know a guy who used a dremil with a cement bit to drill holes in small lr and used tie lock straps to put them together to make a wall in a nano tank. he also used egg crate to attach the wall together...