What size replacement filter cartridge for this unit...small, med?

The Tetra Bio-Bag Large (formerly known as Regular) are the exact same as the filter bag supplied with the Tetra Whisper In-Tank filter 20i. I got both from Amazon: filter $11.89; 12 cartridges $12.28. These filters last a long time, can be cleaned and reused. For my purpose, this filter has been great.

Where can I just get the Bioscrubber?

Hello. You can get it at a pet store, amazon has some, grocery stores with a pet section...they are pretty easy to find.

Would a small fish get sucked up in this filter? I have a 2 month old beta who is just recently getting color fins but still very small

Yes. I had 4 neon tetras and all 4 ended up getting sucked into the filter and the spinning fan mechanism blended them into multiple pieces. It happened the first night, I woke up and 4 fish were missing. I found them in the filter :(

Would this filter be too strong for a Betta in a 10 gallon tank?

Yes, it would be fine. It is rated at 90 GPH which is the appropriate flow rate for a 10 gallon tank. Bettas are not the strongest swimmers, it is true, but typically handle filtration fine, as long as it is placed at one end of the tank so they have room to move away if necessary. They eventually adapt and will often play in the flowing water. Initially, you might want to place tall plants or tall décor in front of it to break up the flow until the betta becomes accustomed to it. For additional assistance, please call the Tetra Consumer Relations Team at 1-800-526-0650.

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Tetra Aquarium Filter (AQ-78056),Up to 4-Gallons

Tetra Aquarium Filter (AQ-78056),Up to 4-Gallons

Product ID: 357304783

Details

Brand
Tetra
Colour
Blue
EU Spare Part Availability Duration
1 Years
Global Trade Identification Number
Item Weight
0.26 Kilograms
Material
Plastic

⚡27 GPH motor power

📏Space-saving 1-inch wall clearance

🧼3-stage filtration system

R1419

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Description

🐠 Elevate your aquarium game with whisper-quiet power and sleek design!

CUSTOMIZABLE SETUP - Adjustable clip and suction cup adapt to any water level or tank configuration for perfect fit and flow.
TRIPLE ACTION FILTRATION - Mechanical, chemical, and biological filtration traps debris, removes odors, and keeps water pristine.
SLEEK SPACE SMART DESIGN - Clips discreetly inside your tank, allowing placement just 1 inch from the wall—maximize your living space.
WHISPER QUIET 27 GPH MOTOR - Cycles your 4-gallon tank over 6x/hour for crystal-clear water without noise distractions.
EFFORTLESS CARTRIDGE CHANGES - Hinged lid and Small Whisper BioBag cartridges make maintenance quick and mess-free.

The Tetra Whisper 4i Internal Power Filter is engineered for 1-4 gallon aquariums, featuring a 27 GPH motor that cycles water over six times per hour. Its three-stage filtration system—mechanical, chemical, and biological—ensures clean, odor-free water. Designed to save space, it clips inside the tank allowing placement just 1 inch from the wall. Easy cartridge changes and adjustable mounting make it ideal for both beginners and seasoned aquarists seeking hassle-free, efficient filtration.

Specifications

ASIN	B07JC6LST2
Brand Name	Tetra
Colour	Blue
Country of Publication	USA
Customer Reviews	3.9 3.9 out of 5 stars (5,305)
EU Spare Part Availability Duration	1 Years
Global Trade Identification Number	00046798780564
Included Components	See label
Item Highlight	For Fish Tanks Up To 4 Gallons, Whisper Quiet, 3-Stage Filtration, Space-Saving Internal Filter Clips on Tank
Item Type Name	Aquarium Filter
Item Weight	0.26 Kilograms
Manufacturer	Tetra
Manufacturer Part Number	AQ-68056
Material Type	Plastic
Model Number	AQ-68056
Number of Items	1
Number of Packs	1
Power Source	Corded Electric
Product Style	Up to 4-Gallons
Specific Uses For Product	Indoor
UPC	046798780564
Unit Count	1.0 Count
Voltage	120 Volts

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R1419

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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