will this work with a 120 gallon tank or do we need to purchase 2 sets?

yes I would order 2 sets for 120 gal I have mine in a 60 gal and it was a perfect fit .. ( side note .. make sure any air stones are above the gravel .. my powerhead was sucking air through the tube until i moved it )

Will this work with course sand? Or will it fill with sand?

Yes it should work , use an air pump do not use filter motor , you want the water to flow. A motor will create pressure. If you’re concerned about sand filling the tube use a weed blocking fabric. Gardeners been using this fabric to block the sunlight out but water still goes through it

Will it work for a tank wifh no gravel?

Not really... The gravel weighs it down and is PART of the filtration process... That'sa THE POINT of an under gravel filter

Can this be adapted/connected to a canister filter's intake?

I have a gravel filtration system with an external canister and I literally never have to change my water on a 55 gallon. I add water as needed and clean the filter maybe once a month

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$Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium$

Undergravel Filteration Bottom Circular Bar 45.3\x 9.6 Under Gravel Filter Tube Aquarium

Product ID: 16796285

Details

Brand
CORISRX
Capacity
55 gallons
Color
White
Material
Polyvinyl
Product Dimensions
45.3"L x x

📏45.3" length for broad coverage

🔄27 PVC tubes for optimal water flow

🧩7 L-shape connectors for flexible setup

Description

🌊 Elevate your aquarium’s flow game with seamless undergravel filtration!

27 DURABLE PVC TUBES - Ensure consistent water circulation beneath gravel for a healthier aquatic environment.
HEAVY DUTY PVC BUILD - Rely on sturdy, corrosion-resistant materials designed to last and maintain peak performance.
EXPANSIVE 45 3 COVERAGE - Maximize filtration area with a broad circular bar design that fits large tanks seamlessly.
DISCREET UNDERGRAVEL SETUP - Keep your aquarium aesthetic clean by hiding filtration tubes beneath gravel effortlessly.
VERSATILE L SHAPE CONNECTORS - Customize your filtration layout with 7 flexible joints for perfect fit and flow.

The UP Bottom Circular Bar Undergravel Filteration system features a 45.3" length with 27 PVC tubes and 7 L-shaped connectors, designed to optimize water flow beneath gravel in aquariums up to 55 gallons. Made from durable PVC, it offers a discreet and customizable filtration solution that enhances tank health and aesthetics.

Specifications

ASIN	B00ZUIRGOU
Best Sellers Rank	#330,620 in Pet Supplies ( See Top 100 in Pet Supplies ) #5,061 in Aquarium Filter Accessories
Brand Name	CORISRX
Capacity	55 gallons
Color	White
Customer Reviews	3.8 3.8 out of 5 stars (155)
Item Dimensions L x W x H	45.3"L x 9.65"W x 9.65"H
Item Weight	0.63 kg
Manufacturer	UP AQUA
Manufacturer Part Number	Aqu-5397
Material Type	Polyvinyl Chloride (PVC)
Model Number	D62140
Shape	Round
Unit Count	1 Count

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