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.

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Seachem Flourish Gravel Bed Tablets, 10-Count

Product ID: 48995706

Details

Brand
Seachem
Item form
Tablets
Item weight
0.8 Ounces
Liquid volume
10 Gallons
Number of Packs
1

⏳Lasts 3-4 weeks per dose

⚡Targets root zone directly

🌱Micro & trace nutrient boost

B/.55

Duties & taxes included

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Sold byAmazon PanamaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Root your aquarium’s success with Seachem Flourish Tabs!

UNIVERSAL FIT - Perfectly dosed for standard 10-gallon tanks—scale easily for larger setups.
OPTIMIZED GROWTH CYCLE - Supports lush, vibrant aquatic plants with a scientifically balanced formula.
EFFORTLESS AQUARIUM CARE - Simply insert tablets into gravel every 3-4 weeks for continuous plant vitality.
PRECISION ROOT NUTRITION - Delivers essential micro and trace elements exactly where your plants need them most.
TRUSTED QUALITY LONGEVITY - Made in the USA with a 2-year warranty, backed by thousands of 5-star reviews.

Seachem Flourish Gravel Bed Tablets provide a potent blend of micro and trace nutrients designed to nourish aquatic plant roots directly in the gravel bed. Each tablet supports optimal plant growth for 3-4 weeks, making it easy to maintain a thriving planted aquarium. Ideal for 10-gallon tanks and scalable for larger setups, these tablets are manufactured in the USA and come with a 2-year warranty, trusted by thousands of aquarists worldwide.

Specifications

ASIN	B000255QLG
Best Sellers Rank	4,244 in Pet Supplies ( See Top 100 in Pet Supplies ) 5 in Health Supplies for Fish & Aquatic Pets
Brand Name	Seachem
Country Of Origin	USA
Customer Reviews	4.6 4.6 out of 5 stars (5,958)
Global Trade Identification Number	00000116050500
Included Components	aquarium plants
Item Form	Tablets
Item Type Name	growth stimulating tablets for plant roots
Item Weight	0.8 Ounces
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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