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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🌊 Dive into clarity with Tetra Whisper!

VERSATILE USE - Perfect for aquariums up to 30 gallons, suitable for all life stages.
ALL IN ONE SOLUTION - Combines air pump and filter for optimal water quality.
SPACE SAVING DESIGN - Mounts flush against the wall for a sleek aquarium setup.
EFFORTLESS MAINTENANCE - Large Bio-Bag cartridges make changing filters a breeze.
WHISPER QUIET OPERATION - Enjoy a serene aquatic environment without disruptive noise.

The Tetra Whisper Internal Filter is a powerful and efficient filtration system designed for aquariums ranging from 10 to 30 gallons. Featuring a dual-sided mesh filter that captures debris and fish waste, it also aerates water with an air-driven design, filtering up to 125 gallons per hour. Its convenient design allows for easy maintenance with large Bio-Bag cartridges, making it an ideal choice for both novice and experienced aquarists.

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Pet Type	Aquatics, PetSupplies, Aquatics Filtration Internal Filters, Aquatics Filtration
Product Dimensions	12.4 x 13.67 x 25.88 cm; 657.71 g
Batteries	Product Specific batteries required.
Item model number	25817
Pet Life Stage	All Life Stages
Flavor	Flavorless
Item Form	Power
Allergen Information	Gluten
Color	Blacks & Grays
Size	Up to 30-Gallons
Volume	5 Liters
Number of Items	1
Quantity	1
Specific Uses	Active
batteries required	No
Batteries Included	No
Item Weight	658 g

Tetra Whisper Internal Filter 10 To 30 Gallons, For aquariums, In-Tank Filtration With Air Pump

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