is this the 1-2mm grain size? I do not want the fine grain.

It's is not the fine grain that blows all over the tank. All crushed coral and sand around 1-2mm

Would it be ok with burrowing invertebrates?

Yes. Works awesome with borrowing invertebrates

Can you store this sand for some time if not used right away? Will it go bad on you? Does it have an expiration date?

The sand itself will not go bad but the bacteria will go bad after about 12 months of manufacturing. Most life sand bags have a expiration date on them.

I currently have a two year established tank with the fine Fuji pink and so badly want to change to this.. what’s the best way?

In small sections at a time. There are some great tutorials on YouTube. Be very careful. Unless of course your just going to start over. Clean out tank and redo. But in that case your tank would no longer be established. Don’t clean and use old filters and that’ll help with starting the cycling process over. That way it won’t be completely restarting at zero. Goodluck

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CaribSea Arag-Alive Special Grade Reef Sand, 20-Pound

Product ID: 7735874

Details

Brand
Carib Sea
Liquid Volume
20 Liters
Item Weight
20 Pounds
Item Form
Granules
Target Species
Fish

🌊Optimal grain size 0.039-0.078 inches

🦠Millions of beneficial marine bacteria

🏝️Authentic aragonite substrate for reef aquariums

$301.66

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Description

🏝️ Elevate your reef game with nature’s own foundation!

EASY INTEGRATION - Designed for smooth acclimation and minimal disturbance to existing tank inhabitants.
BIO BOOSTED FILTRATION - Infused with millions of beneficial bacteria to supercharge your aquarium’s biological filtration.
VERSATILE MARINE VIBES - Multiple styles available to perfectly recreate any marine environment you desire.
ECO FRIENDLY REEF SUPPORT - Aragonite substrate naturally stabilizes pH and supports coral health for thriving ecosystems.
PRECISION GRAIN PERFECTION - Special Grade sand with ideal grain size for natural reef aesthetics and optimal water flow.

CaribSea Arag-Alive Special Grade Reef Sand is a 20-pound premium aragonite substrate designed for marine aquariums. With a precise grain size between 0.039 and 0.078 inches, it offers a natural look while enhancing water flow. Infused with millions of beneficial marine bacteria, it boosts biological filtration and supports a healthy reef environment. Ideal for recreating diverse marine habitats, this substrate stabilizes pH and promotes coral vitality, making it a must-have for serious reef keepers.

Specifications

ASIN	B0002DH0YO
ASIN	B0002DH0YO
Age Range Description	all
Best Sellers Rank	#163,495 in Pet Supplies ( See Top 100 in Pet Supplies ) #146 in Aquarium Sand
Brand Name	Carib Sea
Color	Wheat
Customer Reviews	4.5 4.5 out of 5 stars (138)
Date First Available	October 2, 2001
Date First Available	October 2, 2001
Department	Unisex-Adult
Department	Unisex-Adult
Directions	1. Acclimate the sand to your aquarium by mixing it with existing substrate or adding it slowly to minimize disturbance. <br> 2. Rinse the sand gently with tank water before adding it to the aquarium. <br> 3. For new tanks, add sand after setting up other equipment and before adding water. <br> 4. In existing tanks, add sand slowly to minimize disturbance to existing inhabitants. <br> 5. After add…
Included Components	CaribSea Arag-Alive Special
Is Discontinued By Manufacturer	No
Item Dimensions LxWxH	18 x 12 x 2 inches
Item Package Dimensions L x W x H	16.54 x 11.42 x 2.36 inches
Item Weight	20 Pounds
Item model number	790
Item model number	790
Manufacturer	Carib Sea
Manufacturer	Carib Sea
Material	Plastic
Model Name	CaribSea Arag-Alive Special Grade Reef Sand, 20-Pound
Product Dimensions	18 x 12 x 2 inches; 20 Pounds
Size	20 lb
Specific Uses for Product	Urinary
Target Audience Keyword	Fish, algae-eaters
Warranty Description	kkk

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