Free within Nairobi CBD.
The air stone will increase the water circulation more than an undiffused air feed into the tank from an air pump, and the bubbles themselves will also increase the surface area of the water more, but the real benefit from an air stone as far as oxygenation goes is just the increase in circulation.
It also helps a lot in seasonally overheated tanks, and can keep fish alive if it gets too hot. Warmth reduces water's ability to hold oxygen.
For fastwater fish, they can be stimulating, as moving water carries oxygen. A powerhead will do that many times better though.
They can provide oxygen to fish eggs.
We hand-pick our favorites and send you the hottest deals every week!