Quick Answer
Seiryu stone has dramatic gray-blue texture and is popular in aquascaping. Because it is limestone-based, it can raise hardness and alkalinity, so it needs testing in soft-water aquariums.
Care and Setup Notes
- Test water before and after adding a large amount of stone.
- Use fewer pieces if you need soft acidic water.
- Stabilize rock piles to prevent pressure points on glass.
What to watch
Use this page as a planning profile, then match the advice to your exact tank size, livestock, temperature, filtration, and water test results. If livestock are already stressed, test ammonia, nitrite, nitrate, pH, and temperature before making big changes.
Image: Wikimedia Commons fish photo used as contextual aquarium reference