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Acid-washed Seiryu rock is a popular grey limestone aquascaping stone treated with a mild acid bath to etch away soft surface calcite. This process:
Deepens the charcoal and blue-grey tones.
Heightens contrast against white veining.
Slightly reduces the stone's immediate tendency to spike aquarium pH and hardness.
Visual & Aesthetic Benefits
Darker Tones: Exposes rich charcoal, deep grey, or bluish hues instead of a chalky light grey.
Sharp Contrast: Makes the fine white calcite lines stand out dramatically, especially underwater.
Clean Details: Strips away residual dust, soft chalky outer layers, or minor stains.
Water Chemistry Impact
Leaching Minerals: Seiryu stone is calcium carbonate-based and still raises general hardness (GH), carbonate hardness (KH), and pH.
Reduced Rate: While acid-washing etches the immediate reactive outer layer, the stone will still buffer water upward, often stabilizing around a pH of 7.6 to 7.9.
Best Suited For: Hardwater setups, African cichlids, livebearers, or Neocaridina shrimp rather than softwater blackwater tanks.