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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🌿 Elevate your aquarium’s ecosystem with volcanic vitality!

PERFECT PORTION SIZE - 4.4 lbs of premium substrate, ideal for standard aquarium setups.
DUAL PURPOSE SUBSTRATE - Designed specifically for both live plants and delicate shrimp habitats.
VOLCANIC POWER FOR YOUR TANK - Harness mineral-rich volcanic soil to supercharge aquatic plant vitality.
OPTIMIZED P H FOR THRIVING LIFE - Promotes a neutral to mildly acidic environment perfect for plants and shrimp.
ECO FRIENDLY EASY MAINTENANCE - Environmentally conscious formula that’s simple to clean and use.

Fluval Plant and Shrimp Stratum is a 4.4 lb mineral-rich volcanic soil substrate designed to stimulate robust aquatic plant growth while maintaining a neutral to mildly acidic pH, ideal for live plants and shrimp. Easy to use and environmentally friendly, it supports a thriving, balanced aquarium ecosystem.

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Brand	Fluval
Model Number	12693
Color	Stratum
Product Dimensions	7.62 x 15.24 x 27.94 cm; 2 kg
Material	Plastic
Special Features	Easy to Clean, Easy to Use, Environmentally Friendly
Item Weight	2 Kilograms

FluvalPlant and Shrimp Stratum, For Fish Tanks, 4.4 lbs., 12693

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