Can these be planted with a tank full of water as after thought?

Yes can be planted anytime, just push them into the gravel near the plants

They are pushed into the substrate at the roots of your aquatic plants. For dosage read the pack.

Will they work in my 17 L heavily planted Guppy baby nursery tank? It has no substrate other than java moss, stem plants & a banana plant.

I would have thought so, yes..I have a gravel bed & push one every 4 months under each plant base & they’re doing wonderfully well, I have lush healthy & thick foliage since using these tabs. I cannot say for sure as you have no substrate but I’d say give it a go. These tabs totally change the water ph though & I no longer have to battle with algae overgrowth which is another plus but be sure to change your water regularly as in my case my Angel fish’s eye went white but as long as I change the water every week he stays just fine.

Does the tab dissolve in water eventually? Or do I need to take the old tab out every 3-4 months?

You leave it in.. the plants will use it up.

Seachem Flourish Gravel Bed Tablets 10 Count

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360 kr

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Sold byAmazon NorwayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Root your aquarium’s success with Seachem Flourish Tabs — growth you can see, care you can trust!

EFFORTLESS AQUARIUM CARE - Simply insert tablets every 10-15 cm radius for consistent, hassle-free plant growth.
PRECISION ROOT NUTRITION - Delivers essential micro and trace elements exactly where your plants need them most.
LONG LASTING GROWTH SUPPORT - Each tablet nourishes your planted tank for up to a month, reducing maintenance frequency.
OPTIMIZED FOR 10 GALLON TANKS - Perfectly dosed with 6 tablets for standard 10-gallon aquariums, ensuring balanced nutrient delivery.
TRUSTED QUALITY PERFORMANCE - Backed by Seachem’s 2-year warranty and a 4.6-star rating from over 6,000 aquatic enthusiasts.

Seachem Flourish Gravel Bed Tablets are specialized nutrient tablets designed to deliver essential micro and trace elements directly to the root zone of aquatic plants. Ideal for planted aquariums up to 10 gallons, these tablets promote healthy, vibrant plant growth with a simple dosing schedule of one tablet every 10-15 cm radius, lasting 3-4 weeks per application. Trusted by thousands, they combine convenience with proven performance to elevate your aquatic ecosystem.

Specifications

ASIN	B000255QLG
Best Sellers Rank	2,855 in Pet Supplies ( See Top 100 in Pet Supplies ) 4 in Health Supplies for Fish & Aquatic Pets
Brand Name	Seachem
Country Of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (6,002)
Global Trade Identification Number	00000116050500
Included Components	aquarium plants
Item Form	Tablets
Item Type Name	growth stimulating tablets for plant roots
Item Weight	20 g
Liquid Volume	10 Gallons
Manufacturer	Seachem
Manufacturer Part Number	075230
Model Number	67105050
Number of Items	1
Number of Packs	1
Pet Type	Fish
Product Warranty	2 years
Target Species	Aquatic Plants
UPC	781163244851 000116050500 074994343887
Unit Count	30.0 gram

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