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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Description

💦 Keep it clean, keep it serene!

ALL IN ONE PACKAGE - Get started right away with everything you need included: hinged lid, tank clip, internal filter, and filter cartridge.
COMPACT DISCREET - Maximize your space! The sleek design allows for flush mounting against the wall, seamlessly blending with your décor.
WHISPERING EFFICIENCY - Experience a serene aquatic environment with a powerful 27 GPH pump that cycles your 4-gallon aquarium over 6 times an hour.
DUAL ACTION FILTRATION - Enjoy crystal-clear water as the two-in-one filter system captures debris and eliminates odors with ultra-activated carbon.
VERSATILE FOR ALL LIFE STAGES - Perfect for any aquatic life, this filter caters to all pet life stages, ensuring a healthy habitat for your fish.

The Tetra Whisper 4i Internal Power Filter is designed for aquariums between 1 and 4 gallons, featuring a 27 GPH pump for efficient water cycling, dual filtration for optimal clarity, and a compact design that fits seamlessly into your space. Ideal for all life stages of aquatic pets, this filter comes fully equipped for immediate use.

Reviews

T**Q

Disappointed !!!

Worst filter, don’t buy this…the motor dies in few hours and doesn’t work anymore.

7.04.2025

B**E

Very bad experience

Motor is not woking properly, very big broken sounds is coming out from the motor, request amazon to refund, very sad.

23.08.2024

S**B

Stopped working after 30mins

Product looked amazing but stopped working after 30mins…

15.02.2023

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Product Dimensions	7.62 x 7.62 x 18.75 cm; 259 g
Item model number	AQ-68056
Pet Life Stage	All Life Stages
Allergen Information	Abalone Free
Color	BLUE
Size	3.78 - 15.14 L
Number of Items	1
Quantity	1
Specific Uses	Indoor
batteries required	No
Batteries Included	No
Item Weight	259 g

Tetra Whisper 4i Internal Power Filter, Filtration for Aquariums Between 1 and 4 Gallons

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