Pollen Glass beetle is a CO2 / Air diffuser for aquariums, which virtually pollinates the entire aquarium with tiny carbon dioxide/air bubbles. Pollen Glass is handmade from high-quality Japanese glass. Unique design Beetle sits conveniently on the inside corner of an aquarium tank. For a large-size tank, Beetle can be placed on multiple numbers of corners. *Pollen Glass Beetle 30Ø is suitable for a 90cm size tank, 40Ø for a 90-120cm tank, and 50Ø for a 120-180cm tank. 30MM specifications: Use on tanks ~90 cm (~50 US Gallon) 40MM specifications: Use on tanks 90cm ~ 120cm Tank (50 ~ 80 Gallon) 50MM specifications: Use on tanks larger than 120cm Tank (Beyond 80Gallon) Article Code Item - 102-103 30Ø for CO2 - 102-113 30Ø for AIR - 102-104 40Ø for CO2 - 102-114 40Ø for AIR - 102-105 50Ø for CO2 - 102-115 50Ø for AIR -
