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-quiet power, crystal-clear vibes.

SLEEK DISCREET - Clips internally to your tank wall, blending seamlessly with your décor—no bulky equipment in sight.
ALL INCLUSIVE SETUP - Comes complete with hinged lid, tank clip, internal filter, and cartridge—ready to install right out of the box.
DUAL ACTION FILTRATION - Combines cartridge floss and ultra-activated carbon to eliminate debris, odors, and discoloration.
ADJUSTS TO YOUR AQUARIUM - Easily adapts to both high and low water levels for consistent performance.
EFFORTLESS AQUARIUM REFRESH - Cycles your 4-gallon tank over 6 times per hour for pristine water clarity.

The Tetra Whisper 4i Internal Power Filter is engineered for aquariums between 1 and 4 gallons, featuring a 27 GPH pump that cycles water over six times per hour. Its dual filtration system combines cartridge floss to trap debris and ultra-activated carbon to remove odors and discoloration. Designed to clip inside your tank, it saves space and stays hidden behind décor. This all-in-one kit includes everything needed for easy installation and maintenance, ensuring a clean, healthy aquatic environment.

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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
Colour	BLUE
Size	1 - 4 Gallons
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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