What are the advantages of putting stones in the fish tank?

Advantages of putting stones in fish tanks: 1. Clean water is not easy for fish to muddy when swimming. 2. It's so beautiful. 3. the fish nest can be hidden and easy to rest. As long as it's not particularly smooth, it's all very enjoyable. Such as: timely, ordinary rocks, etc. There are micropores to cultivate nitrifying bacteria and water quality! But artificial glass beads are not good for water quality maintenance.