This is what 6kg of Real reef rock looks like

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Real Reef Rock (20 lb) Box - Mixed Size - Real Reef

Marco ReefSaver Coralline Rock - 20 lb

Sand and rocks [buy and inform] at Whitecorals

Real Reef Rock

Aquaforest StoneFix 6kg – Total Aquatics Inc.

Real Reef Rock - Medium Rocks 45lb Box – Candy Corals

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Real Reef Rock (by the pound) - Mixed Sizes - Real Reef

Real Reef Rock - Branched box 15/18kg., Reel Reef Rock

Jakarta Live Rock Lands In The US, 52% OFF

QUICK LOOK! REEF READY Mix Real Reef ROCK - Reef-A-Palooza CA

Real Reef Rock - Branched box 15/18kg., Reel Reef Rock