The Marina Betta Kit Rock Ornament not only looks great in the tank, it also functions as a small playground for your betta. It's more fun than having just rocks or sand in the bottom of the tank. This allows them to swim around, over, and through the rock formation. I've purchased two of these, one for each of my betta tanks. They love the rock ornament. Also, it is very easy to clean. Run warm water over it, wipe off any algae growth off with a towel/paper towel, and place it back into the tank...whenever you do a water change.