Air stone Tetra AS 30 by Tetra — aquarium air diffuser stone, model AS 30

Tetra AS 30 air stone is an aquarium air diffuser stone engineered to produce a steady stream of fine bubbles for improved oxygenation and enhanced water circulation. Designed for compatibility with standard aquarium air pumps, the AS 30 model delivers gentle aeration suitable for both freshwater and marine setups. Its fine-porous surface helps disperse air into many small bubbles, supporting gas exchange at the water surface and aiding effective biological filtration without strong currents.

Advantages

The porous construction creates uniform, fine bubbles that increase dissolved oxygen levels and reduce localized dead zones. Compact and simple to install, the diffuser operates quietly and requires minimal maintenance. Materials are selected to withstand continuous contact with aquarium water and deliver consistent performance over time.

Suitable for

• Freshwater community tanks requiring improved surface agitation and oxygenation
• Saltwater aquaria where gentle aeration is preferred to avoid disturbing corals or invertebrates
• Planted tanks where enhanced gas exchange supports biological filtration
• Small to medium aquariums connected to standard external air pumps

Key specifications

• Function: produces fine bubbles for aeration and circulation
• Compatibility: designed for use with standard aquarium air pumps and tubing
• Application: suitable for freshwater and marine environments
• Design: compact, low-flow diffuser for gentle water movement
• Maintenance: washable surface to restore porosity when needed

How to use

Connect the Tetra AS 30 air stone to an air pump using appropriate aquarium tubing, ensuring a secure fit to prevent air leakage. Place the diffuser in the desired location in the aquarium—on the substrate or discreetly behind decorations—to obtain optimal bubble dispersion. Adjust the air pump output to achieve a gentle steady stream of fine bubbles; avoid excessive airflow that may create strong currents. Periodically check and clean the stone if bubble size increases or output decreases.

Usage recommendations

For best results, position the air stone where circulation is needed most and combine with proper filtration. Rinse or gently brush the surface during routine maintenance to maintain fine-porous performance. Select pump output appropriate to tank size to balance aeration with minimal disturbance to inhabitants.