can i use them in sand

Yes they're actually better in sand because they won't fog the water up at all. Just try to place them directly under plants.

How long do they last before having to add a new one?

That will depend on how heavily your tank is planted and how big your plants are. I have three large amazon swords and put one of theses in to the root system of the plant at least once every 6 months. I have a sand substrate but the plants do have a soil ball around their base . Ii hope this has helped

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ROOT TABS Freshwater Aquarium Plant Fertilizer 13 g 10-Count Box

Product ID: 48989847

Details

Brand
API
Global Trade Identification Number
Item form
Tablets
Item weight
29 Grams
Specific uses for product
Aquarium Root

⚡Promotes vigorous root growth

🌱13g nutrient-rich tablets

🔄Monthly replenishment cycle

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Description

🌿 Fuel your aquarium’s green revolution with API Root Tabs!

ROOT POWER BOOST - Delivers essential iron, potassium & carbon for unstoppable plant roots
TRUSTED BY THOUSANDS - 4.6-star rating with nearly 6,000 reviews proves proven performance
VIBRANT GROWTH FORMULA - Keeps freshwater plants lush and thriving with balanced nutrients
EFFORTLESS MONTHLY CARE - Simple tablet dosing every 30 days for continuous plant vitality
AQUARIUM SAFE FISH FRIENDLY - Formulated to nourish plants without harming tropical fish

API Root Tabs Freshwater Aquarium Plant Fertilizer delivers a potent 13g tablet packed with iron, potassium, and carbon to promote strong root development and vibrant plant growth. Designed for monthly use, these tablets ensure your aquatic plants thrive without compromising fish safety. Trusted by thousands of aquarium enthusiasts, this 10-count box is a must-have for lush, healthy freshwater tanks.

Specifications

ASIN	B003OYMOWQ
Best Sellers Rank	1,879 in Pet Supplies ( See Top 100 in Pet Supplies ) 16 in Aquarium Water Treatments
Brand Name	API
Coverage	Aquarium Plants
Customer Reviews	4.6 4.6 out of 5 stars (6,015)
Global Trade Identification Number	00317163035771
Item Form	Tablets
Item Weight	29 Grams
Manufacturer	API
Mixing Ratio	1:30
Model Number	577C
Number of Items	1
Part Number	577C
Specific Uses For Product	Aquarium,Root Development
Target Species	Plants
UPC	317163035771
Unit Count	10.0 count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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4306 som

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

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