Do i need to cap this?

absolutely not......you would never cap "sand". it has no nutrient retention whatsoever. When you layer substrates, IF you layer substrates, you would use something like sand to do the capping. Like, you can do sand over dirt (regular non-fertilized garden soil)......that is excellent. First of all, never spend 35 dollars on a bag of sand.....u can get a 50 lb bag of "play sand" at home depot for 3 bucks.....same damn thing. Sand is Sand. Ive learned over the years that most substrates are common soil aggragates that are repackaged and marked up up 700%. A great great soil is MVP turface. 50 bucks for a 50 pound bag. But in my honest opinion, the best substrate for a planted tank is dirt, withn a 1-2 inch layer of either sand or gravel over it. Never met a plant that wont thrive in old fashioned dirt. Of course the big name companies dont want u to know that though.

How much do I need for a 100 gallon tank?

I suppose it depends on the layout of the tank (tall vs wide), but I used the 8.8lb bag for a 10g plant tank and it was perfect. About 2.5" or so deep. Hope this helps...

Is this a good idea if you going to be siphoning in you aquarium?

As for syphoning - I wouldn't recommend deep syphoning the plant substrate. Just lightly vacuum as needed. In plant tanks I put fine black sand (aquarium safe) on one side of the tank (mainly one front corner) and feed the fish over that corner. That will concentrate food, waste, etc. onto the sand which can be properly vacuumed for cleaning.

would the 4.4 be enough for a 7 gal?

Will 4.4 be good for 5 Gallon Fluval Chi? How often do I have to change this?

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Fluval Plant and Shrimp Stratum, For Fish Tanks, 4.4 lbs., 12693

Product ID: 320888465

Details

Brand
Fluval
Item form
Granules
Item weight
2 kg
Liquid volume
4.4 Liters
Number of Packs
1

🌋Mineral-rich volcanic soil

🌱Boosts strong plant root growth

🧪Optimizes neutral to mildly acidic pH

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Description

🌿 Elevate your aquarium’s ecosystem with volcanic vitality!

P H PERFECT FOR LIFE - Maintains an ideal neutral to mildly acidic environment, perfect for both plants and shrimp.
TRUSTED BY THOUSANDS - Join over 11,000 happy aquarists who rate it 4.6 stars for vibrant, healthy tanks.
BACTERIAS BEST FRIEND - Porous structure encourages beneficial nitrifying bacteria, ensuring crystal-clear water quality.
ROOT FRIENDLY POROUS TEXTURE - Light, non-compacting granules let roots spread effortlessly and plants flourish.
VOLCANIC POWERHOUSE SUBSTRATE - Harness the nutrient-packed energy of Japan’s Mont Aso Volcano for thriving aquatic plants.

Fluval Plant and Shrimp Stratum is a 4.4 lb substrate made from mineral-rich volcanic soil sourced from Japan’s Mont Aso Volcano. Designed to stimulate robust aquatic plant growth, it features a porous, lightweight structure that supports root expansion and beneficial bacteria colonization. It maintains a neutral to mildly acidic pH ideal for live plants and shrimp, making it a top choice for freshwater planted aquariums.

Specifications

ASIN	B00JGQIY48
Allergen Information	Nut Free
Best Sellers Rank	#4,017 in Pet Supplies ( See Top 100 in Pet Supplies ) #143 in Aquarium Accessories
Brand Name	Fluval
Customer Reviews	4.6 4.6 out of 5 stars (11,215)
Global Trade Identification Number	00015561126939
Included Components	All Items listed in Description
Item Form	Granules
Item Highlight	Aquarium Substrate for Planted Aquariums
Item Type Name	HAGEN PLANT&SHRIMP STRATUM 2KG
Item Weight	2 kg
Liquid Volume	4.4 Liters
Manufacturer	Rolf C. Hagen (USA) Corp.
Manufacturer Part Number	12693
Model Number	12693
Number of Items	1
Number of Packs	1
Pet Type	Fish
Target Species	Fish, Shrimp, Plant
UPC	015561126939
Unit Count	2000 Grams

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12793 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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