Petta USB Aquarium Filter for Betta, 11.4–37.9 L, Quiet Adjustable Flow

Petta is a slim USB hang-on-back aquarium filter for betta, planted and aquascaped tanks, sized for 3–10 gal (about 11–38 L) aquariums and rated at 250 L/H.

• Ultra-thin design — fits small aquarium layouts while taking up less space.
• Quiet operation — keeps filter noise low in indoor spaces.
• Adjustable water flow — lets you set a flow that suits the aquarium’s inhabitants and plants.
• Included pre-filter sponge — helps keep young fish and shrimp from being drawn into the filter.
• Waterfall-style return — sends water back into the tank at the outlet.

Small tanks and carefully arranged aquascapes can have limited room for equipment, while fish, shrimp and plants may need different flow conditions. Petta combines a compact hang-on-back format with adjustable flow for small aquariums, planted setups and aquascaping. Its USB connection and low-noise operation make it suited to indoor use where a quieter tank environment matters.

How does Petta return water to the aquarium?

Water flows back into the tank in a waterfall pattern, which increases the water’s oxygen content. Adequate oxygen can promote healthy growth and reproduction in fish and shrimp. The adjustable flow also gives you a way to accommodate aquatic inhabitants and plants with different flow preferences.

• Some fish prefer areas with faster-moving water.
• Some plants need slower flow to maintain growth.

Can I adjust the flow for my fish or planted tank?

Yes, Petta has an adjustable flow rate, so you can choose a setting suited to your aquarium’s occupants and layout. This is useful when a tank includes plants that benefit from slower-moving water alongside fish that prefer faster-flowing areas. The filter is intended for small aquariums, including planted tanks and aquascapes.

• Designed for aquariums holding 3–10 gal (about 11–38 L).
• Rated water flow: 250 L/H.

What does the included pre-filter sponge do?

The pre-filter sponge helps prevent young fish and shrimp from being drawn into the filter. It adds a protective barrier at the intake for tanks where fry or shrimp are present. The sponge is included with the filter.

• Suitable for small fish tanks and shrimp setups.
• The filter can also create a waterfall effect when filtration is not needed.

Petta suits betta keepers, fish and shrimp owners, and aquascapers looking for a slim USB filter with adjustable flow for a small tank. Its 3–10 gal capacity range, waterfall return and included pre-filter sponge make it a compact option for these aquarium setups.

Read our guide: A beginner’s aquarium set-up checklist: from bowl to tank