Seiryu Stones are the most popular scaping stones used in planted aquariums. These stones are more commonly found in Iwagumi style layouts. Each different piece of stones carries unique characteristics crevices and edges. To help you design you next aquarium we made these sets so you can vision these stones in your tank. These stones will raise your water hardness and PH over time, but nothing drastic. This issue can be resolved by doing simple maintenance on your fish tank.