Airstones themselves add next to no oxygen to a tank. Circulation of the entire volume of water & surface agitation is where the oxygenation is done.
Tommy
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Eheim Pimp #204.
58 gal planted Oceanic
Red Turquiose Discus, Japonica shrimp, assorted Blue Eyed Rainbows, Tetras, Hatchets, Danios, Rasboras, etc.
10 gal low tech planted Celestial Pearl Danio (Celestichthys margaritatus) & Emerald Dwarf Rasbora (Microrasbora erythromicron) tank
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