Aquarium Half Ball Airstone

An aquarium half ball airstone—often listed as a semicircle, flat-bottomed, or dome-shaped air stone—is an essential tank accessory designed to efficiently dissolve oxygen into your water. Unlike standard spherical stones that can roll or shift, a half-ball airstone features a flat bottom that keeps it sit stably on the substrate without floating or tipping over.

Key Benefits of Half-Ball Designs

No Floating: The heavy, flat-bottomed design keeps it sitting perfectly straight.

Targeted Placement: It fits snugly into tank corners or open middle spaces without rolling into plants.

Visual Appeal: It creates a wide, uniform "curtain" of rising bubble beams.

Long-Term Maintenance

Algae and mineral deposits will gradually clog the stone over time, reducing bubble flow. Every few months, remove the stone and scrub it thoroughly with a stiff brush. For deep cleans, soak it in a mild bleach-water solution for 2–3 hours, rinse it extensively in fresh water, and let it dry completely before returning it to your tank.