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 Whisper 85 GPH Internal Power Filter For Aquariums | For Fish Tanks Up To 10 Gallons, Whisper Quiet, Space-Saving Internal Filter Clips on Tank

Product ID: 3955183

Details

Brand
Tetra
Color
Black
Global Trade Identification Number
Item Weight
1.1 pounds
Material
ABS PP
Maximum Flow Rate
1.33 gpm

💧85 GPH flow rate

📏Space-saving, clips inside tank

🔇Whisper-quiet motor

KD 9.80

Duties & taxes included

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Description

🐠 Keep it clean, quiet, and classy — your fish tank’s new best friend!

TRIPLE STAGE FILTRATION - Mechanical, chemical, and biological filtration combine to eliminate debris, odors, and toxins.
WHISPER QUIET OPERATION - Enjoy a peaceful aquarium environment with near-silent motor technology.
POWERFUL 85 GPH FILTRATION - Effortlessly circulates and cleans up to 85 gallons per hour for crystal-clear water.
SPACE SAVING INTERNAL DESIGN - Clips discreetly inside your tank, letting you place your aquarium just 1 inch from the wall.
ADJUSTABLE CLIP FOR CUSTOM SETUP - Easily tailor filter height to your tank’s water level for optimal performance.

The Tetra Whisper 85 GPH Internal Power Filter is a premium, USA-made filtration system designed for 5- to 10-gallon aquariums. It features a whisper-quiet motor that efficiently filters up to 85 gallons per hour through a triple-stage filtration process using Bio-Bag cartridges with Stay Clean™ technology. Its space-saving internal design clips inside the tank, allowing placement just 1 inch from the wall, while an adjustable clip ensures easy customization to water levels. Ideal for millennial professionals seeking a sleek, low-maintenance, and effective aquarium filter that blends seamlessly with modern home décor.

Specifications

ASIN	B0002DHYF4
Best Sellers Rank	#1,410 in Pet Supplies ( See Top 100 in Pet Supplies ) #2 in Aquarium Filters
Brand Name	Tetra
Color	Black
Customer Reviews	4.2 4.2 out of 5 stars (22,526)
Flow Rate	1.33 gpm
Global Trade Identification Number	00046798258162
Included Components	Tetra Whisper Internal Power Filter 5 To 10 Gallons, For aquariums, In-Tank Filtration With water pump , Black
Item Dimensions L x W x H	3.8"L x 3.1"W x 7.6"H
Item Type Name	Tetra Whisper Internal Filter
Item Weight	1.1 pounds
Manufacturer	Tetra
Manufacturer Part Number	AQ-65816
Manufacturer Warranty Description	2-Year Limited Warranty
Material Type	ABS, PP
Model Number	AQ-65816
Number of Items	1
Power Source	Corded Electric
Product Style	In-Tank
Specific Uses For Product	Active
UPC	046798258162
Unit Count	1 Count
Voltage	120 volts

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