10 Best Small Aquarium Filter of December 2025

• Ultra Quiet Betta Filter - this air-driven fish tank filter is a motor free filter, super quiet, can only hear the smoothing sound of bubble bursting in the water surface
• Effective Filtration - Mechanical pre-filter sponge captures debris and activated carbon for clean, clear aquarium water. Mini white bubbler stone produces constant, soft bubbles to agitate water, slow flow is great for betta fish, fry and shrimp
• Compact - Single small filter measures 4.1" x 0.8" x 7.6", recommend for 2-5 gallon fresh and salt water aquariums ; Dual filter measures 7" x 0.8" x 7.6", recommend for 6-10 gallon freshwater and saltwater aquariums
• Single sponge filter kit comes with 1 filter+ 3 packs filter cartridges + 1 white air stone+ 1 hanging clip. Dual sponge filter kit comes with 2 filters+ 6 packs filter cartridges + 1 white air stone + 2 hanging clips. Replace filter cartridge every 2-4 weeks depends on how many fish you house
• Easy to install - Connect aquarium filter with air tubing to air pump and ready to go (please note that 3/16 inch air tubing and air pump are excluded). Two suction cups and one hanger helps filter stays in place, no floating. Must be install vertically

hygger

• UNIVERSAL DESIGN Tetra Whisper 20i Internal Filter is an all-in-one air pump and water filter system
• INTERNAL FILTER Mounts on the inside of your aquarium with clip (included)
• CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
• AERATES WATER Air-driven design filters up to 125 GPH while oxygenating water
• CONVENIENT DESIGN Uses large easy to change Bio-Bag cartridges filter mounts inside aquarium making it possible to place tank flush against the wall

Tetra

• Efficiently cleans and filters water
• Auto-start pump requires no priming, automatically restarts if power is interrupted and restored
• Easy to install using suction cups and/or hanging clips
• Carbon Cartridge included for chemical filtration; removes odors and discoloration from water
• Uses Extra Small Aqueon Replacement Cartridges and meant for aquariums up to 3 Gallons
• On average, change filter cartridge every 4 weeks

Aqueon

• ***Refill for Top Fin BF5 BETTAFLO­ Filter & Desktop Aquariums with Element Filters***
• With activated carbon to help remove heavy metals, odors, pigments, and organic waste.
• (2.1 in x 1.9 in x 3.7 in)

Top Fin Element

• QUIET & RELIABLE The Tetra Whisper Power Filter uses 3-stage filtration to create clear clean water – PF 10 treats aquariums up to 10 gallons
• ABSORBS ODORS Ultra-Activated carbon removes both odor and water discoloration
• CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
• INNOVATIVE CLEANING POWER Integrated Stay Clean technology reduces buildup on glass and binds small dirt particles to make them easier to filter
• CARTRIDGE REFILLS Change cartridges monthly uses medium-sized Tetra Whisper Bio-Bag Cartridges (refills sold separately)
• Age Range Description: all ranges
• Included Components: Whisper PF10 Aquarium Filter (5-10 Gal)

Tetra

• Our performance power filter are designed for nanos, betta aquariums, and small desktop aquariums up to 4 gallons.
• The dual stage filtration design provides biological and mechanical filtration for an optimal aquatic environment.
• Plug and play design for easy installation and simple maintenance.
• Promote a healthy aquatic experience with our ultra efficient filtration system.
• We are committed to bringing consumers the highest quality products for the most competitive prices. We value your support and want to provide 100% satisfaction, so please feel free to contact us if you're not 100% satisfied. Replacement cartridges are available on Amazon, search ASIN B00TA87EUW. LOW COST OF OWNERSHIP WITH EA PERFORMANCE CARTRIDGES! https://www.amazon.com/dp/B084Z74BDF?ref=myi_title_dp

EA

• REPLACEMENT CARBON FILTER Keeps aquarium water crystal clear – removes odors and discoloration
• CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
• CLEAN WATER MADE SIMPLE Small size fits Tetra Whisper 3i Internal Filters
• CONVENIENT Replacement filter cartridges are fully assembled and ready to use
• USAGE Change monthly or sooner if there is reduced water flow
• Age Range Description: Adolescent

Tetra

• REPLACEMENT CARBON FILTER Keeps aquarium water crystal clear – removes odors and discoloration
• CATCHES DEBRIS Dense dual-sided mesh filters debris and fish waste
• CONVENIENT Replacement filter cartridges are fully assembled and ready to use
• USAGE Change every 2 weeks or sooner if there is reduced water flow
• Age Range Description: All Life Stages

Tetra

• Fits Aqueon QuietFlow Filter: E Internal 10 gallon
• Ready-to-use cartridge contains high quality activated carbon that keeps water clean, rinse before replacing
• Installs in seconds: align cartridge bottom key slot for an accurate fit inside the Filter
• For optimal performance, change approximately every 4 to 6 weeks
• Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria

Aqueon

• age range description: All Life Stages
• Helps keep your small aquarium healthy and looking beautiful
• Specifically designed for small aquariums up to 5 gallons
• Fits almost any small aquarium shape or size and is compatible with any air pump
• Helps keep your small aquarium healthy and looking beautiful
• Specifically designed for small aquariums up to 5 gallons

Penn-Plax