For use in medium sized to large aquariums, Pollen Glass Large Series is available in 20mm. and 30mm. to suit your aquarium's CO2 needs. Pollen Glass LARGE Series are also recommended for aquarium using many aquatic plants like Riccia fluitans, which requires a large CO2 supply for its growth. Its U-shape glass tube is unobtrusive and eliminates clogging of gas. Handmade, all-glass distributors, designed for long-term use.
Suitable for 90cm aquarium (50 Gallon)
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