Side-by-side equipment comparison

Aragonite Sand vs Silica Sand

Aragonite Sand vs Silica Sand side-by-side comparison. Pros, cons, when to pick each, and recommended setups for each tank type.

Aragonite Sand (CaribSea)

Pros

  • Buffers pH 8.0-8.4 naturally
  • Provides calcium + alkalinity
  • Coralline algae attaches readily
  • Sand-sifting fish eat without grit damage
  • Looks tropical-reef natural

Cons

  • Expensive ($25-50 per 20-lb bag)
  • Dust during initial fill
  • Releases trapped phosphate when disturbed
  • Some grades crumble over time

Silica (Pool Filter or Play Sand)

Pros

  • Cheap ($5-15 per 50-lb bag)
  • Inert (no parameter changes)
  • Available at hardware stores
  • Range of grain sizes available

Cons

  • No pH buffering
  • Wrong chemistry for saltwater (NEVER use)
  • Some play sand contains contaminants
  • Looks less natural in display

Which to pick (by use case)

Use caseRecommended
Saltwater / reefAragonite (CaribSea Special Grade Reef)
African cichlid (Lake Malawi/Tanganyika)Aragonite
Planted freshwaterSilica or inert sand
Goldfish / coldwaterSilica
Discus + soft-water tetrasSilica or fluval Stratum (NOT aragonite - raises pH)

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