How many pieces and shapes do you get?

I would say we got maybe 8-10 pieces/20lb box. They are a good size though. It is really neat stuff!

Can it be used in a fresh water aquarium?

Calcium rocks like sea shells in fresh water will leach out calcium and slowly dissolve. Will make you water turn to hard water over time. I would get plastic version if you like the reef rock style.

Does this need to be rinsed and soaked in R/O water before putting in tank?

It should be rinsed, the purpose of buying this rock is to *not* soak it. The coatings on it are meant to soak into the water in the tank to accelerate the adoption of new water to mature it quicker. I have built 3 aquariums with it, and it goes well, but I have had to black them out twice to kill off algae blooms. Bare rock is better if you intend to control all aspects of the maturity. This is a good product imho.

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CaribSea LifeRock Shapes - 20 lbs - Natural Aragonite Rock for Aquascaping, Supports Coral Growth & Tank Stability for Marine & Reef Tanks

CaribSea LifeRock Shapes - 20 lbs - Natural Aragonite Rock for Aquascaping, Supports Coral Growth & Tank Stability for Marine & Reef Tanks

Product ID: 57353805

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Details

Brand
Carib Sea
Specific Uses For Product
Indoor
Material
Plastic
Compatible Material
Rock Coralline
Item Form
Pellet

🪨20 lbs natural aragonite rock

⏱️Speeds up tank cycling time

⚙️Porous structure for bio-filtration

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Description

🪸 Elevate your reef game with LifeRock — where science meets stunning aquascapes.

P H STABLE SAFE - Maintains perfect water chemistry so your corals and fish thrive without compromise.
BIO BOOSTED FILTRATION - Porous design supports beneficial bacteria, stabilizing your tank’s ecosystem effortlessly.
FAST TRACK TANK CYCLING - Infused with ammonia reducers to get your marine environment balanced in record time.
NATURAL ARAGONITE POWERHOUSE - Authentic textures create stunning reefscapes that impress every guest.
LIMITLESS AQUASCAPING FREEDOM - Build reefs, caves, and ledges with no adhesives—your creativity, unleashed.

CaribSea LifeRock Shapes is a 20-pound natural aragonite rock designed for marine and reef tanks. Its porous structure enhances biological filtration and supports coral growth while maintaining stable pH levels. Infused with biological enhancers, it accelerates tank cycling, enabling faster establishment of a balanced aquatic environment. Ideal for custom aquascaping, it allows reef-building without adhesives, making it a must-have for serious marine aquarium enthusiasts.

Specifications

Brand	Carib Sea
Specific Uses For Product	Indoor
Material	Plastic
Compatible Material	Aragonite-bearing Rock, Artificial Coralline Algae
Item Form	Pellet
Special Feature	Rock
Color	No Color
Item Package Quantity	1
Package Information	Bag
Item Volume	20 Liters
Water Resistance Level	Waterproof
Unit Count	320.0 Ounce
UPC	008479003812
Number of Pieces	4
Global Trade Identification Number	00008479003812
Manufacturer	CARIBSEA INC
Item Package Dimensions L x W x H	20.3 x 15 x 13.3 inches
Package Weight	10.66 Kilograms
Item Dimensions LxWxH	3.25 x 5.75 x 7.5 inches
Item Weight	20 Pounds
Brand Name	Carib Sea
Warranty Description	Warranty
Model Name	…..
Suggested Users	Unisex-Adult
Number of Items	1
Part Number	381
Included Components	……
Size	No Size
Target Species	Fish

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