Live Sand
Biological substrateWhat does Live Sand mean?
Live sand is aragonite (or in freshwater, silica) sand seeded with beneficial nitrifying bacteria + microfauna (copepods, amphipods, worms). Seeds the nitrogen cycle in a new tank and provides sand-sifter food.
How is Live Sand used in aquariums?
Plan 1-2 inches deep for shallow sand bed (SSB), or 4+ inches for deep sand bed (DSB) anaerobic denitrification. Aragonite buffers pH naturally to 8.0-8.4 (marine) but releases trapped phosphate when disturbed - vacuum sand carefully or use a sand-sifting goby/starfish.
How Live Sand fits the bigger picture
Understanding Live Sand matters because it's connected to broader husbandry decisions: aquascaping decisions are hard to undo - plan rockwork + sand bed + flow paths before adding livestock.
Browse the Fast Aquatics care library for full husbandry tutorials covering Live Sand in context.
Frequently asked questions
What does Live Sand mean in fishkeeping?
Live sand is aragonite (or in freshwater, silica) sand seeded with beneficial nitrifying bacteria + microfauna (copepods, amphipods, worms). Seeds the nitrogen cycle in a new tank and provides sand-sifter food. Plan 1-2 inches deep for shallow sand bed (SSB), or 4+ inches for deep sand bed (DSB) anaerobic denitrification. Aragonite buffers pH naturally to 8.0-8.4 (marine) but releases trapped phosphate when disturbed - vacuum sand carefully or use a sand-sifting goby/starfish.