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 Aquarium Plant Fertilizer, 10-Count, Multicolor

Product ID: 269841798

Details

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

⏳Slow-release nutrient tabs

🌱Iron-rich root growth booster

🎨Enhances vibrant plant coloration

Description

🌿 Grow bold roots, vibrant leaves, and envy-worthy tanks!

ALGAE DEFENSE - Healthy plants outcompete algae, reducing unsightly growth and keeping your tank pristine.
DEEP ROOT POWER - Iron and potassium fuel strong, healthy roots for unstoppable plant growth.
FISH SAFE FORMULA - Expertly crafted to nourish plants without harming your tropical fish community.
SUSTAINED NUTRIENT RELEASE - Slow-dissolving tabs provide continuous nourishment, keeping your plants thriving longer.
VIBRANT AQUARIUM AESTHETICS - Boosts rich, natural colors that make your aquatic plants the centerpiece of your tank.

API Root Tabs Aquarium Plant Fertilizer delivers essential iron, potassium, and carbon in slow-release tablets designed to promote robust root development and vibrant aquatic plant growth. Safe for tropical fish, these tabs help prevent yellowing and leaf drop by continuously supplying nutrients, while supporting algae control through healthier plants. Ideal for both new and established aquarium plants, API Root Tabs transform your underwater environment into a lush, colorful oasis.

Specifications

ASIN	B003OYMOWQ
Best Sellers Rank	#8,010 in Pet Supplies ( See Top 100 in Pet Supplies ) #47 in Aquarium Water Quality Testing & Treatment
Brand Name	API
Coverage	aquarium plants
Customer Reviews	4.5 4.5 out of 5 stars (6,248)
Global Trade Identification Number	00317163035771
Item Form	Tablets
Item Type Name	API Root Tabs Aquarium Plant Fertilizer, 10-count
Item Weight	13 Grams
Manufacturer	API
Mixing Ratio	1:30
Model Number	577C
Number of Items	72
Number of Packs	1
Part Number	577C
Specific Uses For Product	Active
Target Species	Aquarium Plants
UPC	317163035771
Unit Count	1 Count

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