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This glass suction tube for an external filter is suitable for an aquarium in which fish swim that appreciate calm currents. With its round shape, the Poppy Glass has a cute character.
See the table below for the desired type.
(outflow filter is available separately: link )
The CO2 Music Counter from Do!aqua is a glass CO2 bubble counter that makes it easy to measure the amount of added CO2. The CO2 bubble counter is filled with water and attached to the outside of the aquarium with the supplied transparent suction cups.