are they copper free?

yes. no copper. api has a phone number you can call for more info. i have found them very helpful when i had questions.

My tank is 30 gl I need use how many tablets?

The instructions say you should use 1 tablet for every 30 square inches of gravel surface area. Most 29 gallons are 30" x 12", which is a total of 360 square inches. Divide that by the recommended 30 square inches per tablet and you will need to use 12 tablets for the aquarium, once per month. Of course, that's providing your aquarium is 30" x 12".

i have a 20 gallon tank, can i use theese with the liquid c02 booster and leaf zone or flourish excel?? or will i be adding to much.

I use them with leaf zone and flourish Excel... no problem so far...I do not treat the whole tank with this tabs... I only add them to specific plants that need more nutrients such as my aponogetons ( bulbs)

I need use how many tablets for 30 gl?

I put all 10 inside a 60 gal. I guess just put 5 for the 30 gal.

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API Root TABS Freshwater Aquarium Plant Fertilizer 0.4-Ounce 10-Count Box,Tablets

API Root TABS Freshwater Aquarium Plant Fertilizer 0.4-Ounce 10-Count Box,Tablets

Product ID: 80259218

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Details

Brand
API
Item Weight
29 Grams
Item Form
Tablets
Coverage
Full
Specific Uses For Product
Plant Growth

⏳Monthly slow-release formula

⚡Essential nutrient infusion

🌱Strong root growth booster

Description

🌿 Elevate your aquarium’s green game—because your plants deserve VIP roots!

TRUSTED LEGACY - Backed by 50+ years of API’s research-driven aquarium innovation.
ROOT POWER UNLEASHED - Promotes vigorous root development for lush, thriving freshwater plants.
NUTRIENT RICH FORMULA - Packed with iron, potassium, and carbon to fuel vibrant aquatic growth.
EFFORTLESS MONTHLY CARE - Just one tablet per month keeps your aquarium plants flourishing with minimal hassle.
FISH SAFE ECO FRIENDLY - Formulated to be safe for tropical fish, ensuring a balanced, healthy ecosystem.

API ROOT TABS Freshwater Aquarium Plant Fertilizer delivers essential nutrients like iron, potassium, and carbon directly to the roots of aquatic plants. Designed for monthly use, these tablets promote strong root development and sustained plant health in freshwater tanks, all while being safe for tropical fish. With over five decades of trusted API innovation, this product ensures your aquarium plants thrive effortlessly.

Specifications

Brand	API
Item Weight	29 Grams
Item Form	Tablets
Coverage	Full
Specific Uses For Product	Plant Growth,Aquarium,Root Development
Target Species	Aquatic Plants
Global Trade Identification Number	00317163035771
Manufacturer	Aquarium Pharmaceuticals
Number of Items	72
UPC	317163035771
Net Quantity	2 count
Department	Unisex-Adult
Country of Origin	USA
Item model number	577C
Product Dimensions	12.38 x 0.64 x 16.51 cm; 29 g
ASIN	B003OYMOWQ