What kind of sand will i need

I think you should google "how to choose aquarium substrate". I'm far from an expert but many factors go into choosing like: is your tank freshwater or saltwater, do your fish need to burrow, do your fish like to sift the substrate, are you going to keep plants in the tank. Once you set up a tank, the substrate will probably be the hardest thing to change. Good luck!

How much & big is 5 lbs?

I’ve bought about 5-6 separate 5 pound boxes. Each box holds about 5-7 medium size rocks. 4-7 inches in size. Great rock to scape with easy to work with.

Is this real limestone? Im hoping it will help raise the ph and harden the water in my aquarium

Yes, it's oolitic limestone, they just cut it to make the stax shapes.

How many boxes are good for 12 gallons?

If there are no other rocks already in the tank, I would use 2-3 boxes. It is better to have extras than look barren. I supplemented my 55 gallon tank with just one box but I had four large rocks in already.

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STAX by 5 lb

Product ID: 57003818

Details

Age Range (Description)
All Life
Brand
Two Little
Flavor
Unflavored
Item Form
Stick
Specific Uses For Product
Aquarium

🌊Marine & freshwater safe

🪨Flat, stackable limestone

♻️100% natural & sustainable

HK$817

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Description

🪨 Stack your style, dive into creativity!

CORAL FRIENDLY BASE - Ideal foundation for coral frags with AquaStik or CorAffix adhesives
READY TO USE CONVENIENCE - No curing needed—immediately build stunning underwater landscapes
ECO CONSCIOUS CRAFTSMANSHIP - Sustainably collected, chemical-free limestone for guilt-free creativity
EFFORTLESS LAYERED AQUASCAPES - Flat, dual-sided surfaces for secure, gravity-defying stacking
VERSATILE AQUARIUM COMPATIBILITY - Perfectly suited for both marine and freshwater environments

STAX by 5 lb offers flat, porous oolitic limestone rocks designed for building stable, layered aquascapes in both marine and freshwater aquariums. Each piece is sustainably sourced, pest-free, and ready to use without curing, enabling aquarium enthusiasts to create unique, gravity-defying structures and coral bases with ease.

Specifications

ASIN	B073DL2N2B
ASIN	B073DL2N2B
Additional Features	Stackable, porous limestone for creative aquascaping and eco-friendly material
Age Range Description	All Life Stages
Animal Food Diet Type	Veterinary Diet
Best Sellers Rank	#159,582 in Pet Supplies ( See Top 100 in Pet Supplies ) #261 in Aquarium Décor Rocks
Brand Name	Two Little Fishies
Breed Recommendation	Small Breeds
Container Type	Bag
Customer Reviews	4.4 4.4 out of 5 stars (319)
Date First Available	June 27, 2017
Dog Breed Size	Small
Flavor	Unflavored
Item Form	Stick
Item Weight	2.27 kg
Item model number	STA5
Manufacturer	Two Little Fishies
Manufacturer	Two Little Fishies
Manufacturer Part Number	43349-7880
Model Number	STA5
Number of Items	1
Occasion	Birthday
Product Benefits	Allows creative aquascaping and provides stable structures; eco-friendly.
Product Dimensions	2 x 6.2 x 2 inches; 5 pounds
Recommended Uses For Product	Aquascaping in marine or freshwater aquariums
Special Ingredients	Limestone
Specific Uses For Product	Aquarium Decoration, Aquascaping
Target Species	Fish
UPC	748172401040
Unit Count	80 Ounce

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HK$817

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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