Some good examples of basic aquarium accessories are gravel, decorative ornaments, artificial plants and natural decor such as rocks or driftwood. Scenic backgrounds that provide colorful backdrops for the fish and hide equipment on the back of the aquarium are also popular.
A typical aquarium store carries a wide selection of aquarium accessories. Some of these are just for fun, such as bubbling ornaments that move around in the aquarium, but others create natural environments for the aquarium's inhabitants. Rocks, caves and castles all provide shelter and safety for the fish and create an appealing visual effect for the aquarium owner.