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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API Root Tabs Plant Fertilizer for Freshwater Aquariums (10 Count, 13g)

Product ID: 48989847

Details

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

⏳Monthly slow-release formula

🌱13g nutrient-rich tablets

🪴10-count pack for lasting growth

Description

🌿 Unlock your aquarium’s full potential with every root tab!

TRUSTED QUALITY - Top-rated with 4.6 stars from over 6,000 aquarium enthusiasts
ROOT POWER BOOST - Promotes vigorous root development for lush, thriving aquarium plants
SAFE FISH FRIENDLY - Formulated to be safe for tropical fish, ensuring a balanced ecosystem
EFFORTLESS MONTHLY CARE - Simply add one tablet per 194 sq cm of gravel for continuous nourishment
ESSENTIAL NUTRIENT BLEND - Packed with iron, potassium, and carbon to fuel vibrant aquatic growth

API Root Tabs are 13-gram, slow-release fertilizer tablets designed to nourish freshwater aquarium plants by delivering essential nutrients like iron, potassium, and carbon directly to the roots. Each 10-count box supports strong root growth and vibrant plant health with monthly dosing, all while being safe for tropical fish and easy to use.

Specifications

ASIN	B003OYMOWQ
Application Method	Add tablets to the gravel bed
Best Sellers Rank	3,007 in Pet Supplies ( See Top 100 in Pet Supplies ) 22 in Aquarium Water Treatments
Brand Name	API
Coverage	Aquarium Plants
Customer Reviews	4.6 4.6 out of 5 stars (6,275)
Global Trade Identification Number	00317163035771
Item Form	Tablets
Item Weight	13 Grams
Manufacturer	API
Mixing Ratio	1:30
Model Number	577C
Number of Items	1
Number of Packs	1
Part Number	577C
Specific Uses For Product	Aquarium,Root Development
Target Species	Aquarium Plants
UPC	317163035771
Unit Count	10.0 count

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