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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Whisper Internal Filter 10 To 20 Gallons, For aquariums, In-Tank Filtration With Air Pump

Whisper Internal Filter 10 To 20 Gallons, For aquariums, In-Tank Filtration With Air Pump

Product ID: 250498430

Details

Brand
Tetra
Global Trade Identification Number
Included Components
Aquaria Tetra
Item Weight
1.45 Pounds
Manufacturer
Tetra
Material
100% Polyester

💨125 GPH air-driven filtration

🔇Ultra-quiet in-tank motor design

🧽Dual-sided dense mesh debris catcher

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Description

🐠 Whisper-quiet power that keeps your aquarium flawless and your space sleek.

EFFORTLESS MAINTENANCE - Large, easy-to-change Bio-Bag cartridges keep your tank pristine with minimal hassle.
SEAMLESS WALL TO TANK FIT - Mounts inside aquarium for flush placement—no bulky external parts.
DUAL ACTION DEBRIS DEFENSE - Dense, dual-sided mesh traps fish waste and debris for crystal-clear water.
POWERFUL SILENT FILTRATION - Air-powered system filters up to 125 gallons per hour with whisper-quiet operation.
VERSATILE WATER LEVEL ADAPTABILITY - Adjusts easily to high or low water levels—perfect for turtles or waterfall effects.

The Tetra Whisper Internal Filter 10 to 30 Gallons is an air-powered, in-tank filtration system designed for quiet, efficient water purification. Featuring a dense dual-sided mesh and easy-to-replace Bio-Bag cartridges, it filters up to 125 gallons per hour while oxygenating water. Its compact design allows tanks to be placed flush against walls, making it ideal for both aesthetic and functional aquarium setups.

Specifications

ASIN	B0002DHYG8
Brand	Tetra
Brand Name	Tetra
Capacity	30 Gallons
Country Of Origin	USA
Customer Reviews	4.4 out of 5 stars 5,060 Reviews
Global Trade Identification Number	00046798258179
Included Components	Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump
Item Type Name	Tetra Whisper Internal Filter
Item Weight	658 g
Manufacturer	Tetra
Manufacturer Part Number	AQ-65817
Material	100% Polyester
Material Type	100% Polyester
Model Name	AQ-65817
Model Number	25817
Power Source	Air Powered
Power Source Type	Air Powered
Purification Method	Ultra Filtration
UPC	046798258179
Unit Count	1 Count
Whats in the box?	Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump

Reviews

V**.

20.01.2019

R**X

22.02.2026

A**L

27.01.2026

M**N

27.03.2023

B**E

23.08.2024

F**A

22.01.2026

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113044CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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