I keep cholla in my cray and shrimp tanks as the babies will hide in and under them. You can stack many Cholla any way you want to create great caves, and crevices as seen in the picture to the left.
Cholla will float if allowed to dry out but I sell them already water logged so they will sink on their own.
You are buying 1 piece that is 6" long and 3/4" to 1 1/2" in diameter. With these pieces, you can lay them next to each other to make them look longer.
If you would like to see my entire stock of driftwood please go HERE