Are you still looking for a small fish tank oxygen pump to worry about it.

Do not worry, here's the air pump you're looking for.

Product name:air oxygen pump-H pump 

Manufacturer: HeYi

Model: YD QB4105

Features: small size, lightweight, low noise, low loss, dragon life

Small and compact design, suction connection to the side of the aquarium, clean, modern look.

specification:

color: white

Shape: round

Air flow rate: 0.5 L / min

Voltage: 110-220V / 50-60Hz

Capacity: 50L

Weight: 36g

Power Code: 40 inches

Length of tube: 40 inches

Tube size: 0.15 x 2.4 inches

Suction cup diameter: 1 inch

Packet content: 

1 x Aquarium Air pump -Adapter included 

1 x Air stone

1 x Silicone Tube 

1 x User Manual 

1 x Sucker