Live Rock

What does Live Rock mean?

Live rock is calcium-carbonate rock (typically aragonite-based) populated with beneficial bacteria, microfauna, and sometimes coralline algae. Forms the primary biological filter + biodiversity foundation of a marine tank.

How is Live Rock used in aquariums?

Sources: aquacultured (best - sustainable, no wild collection), reef-cured wild, dry rock + bottled bacteria (cheapest, but slowest cycle). Plan 1-1.5 lb per gallon for marine setups. Cure new uncured rock in a dark bin for 4-6 weeks before placement; it leaches ammonia + dies-off as it cycles.

How Live Rock fits the bigger picture

Understanding Live Rock 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 Rock in context.

Frequently asked questions

What does Live Rock mean in fishkeeping?

Live rock is calcium-carbonate rock (typically aragonite-based) populated with beneficial bacteria, microfauna, and sometimes coralline algae. Forms the primary biological filter + biodiversity foundation of a marine tank. Plan 1-1.5 lb per gallon for marine setups. Cure new uncured rock in a dark bin for 4-6 weeks before placement; it leaches ammonia + dies-off as it cycles.