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102-103 30 for CO2
102-113 30 for AIR
102-104 40 for CO2
102-114 40 for AIR
102-105 50 for CO2
102-115 50 for AIR
Pollen Glass Beetle has a large diffusion base, catering the CO2 needs of aquariums larger than 90cm, and sits conveniently on an inside corner of the aquarium. 30f is suitable 90cm tank, 40F for 90-120cm tank and 50f for over 120cm tank.

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