back to cloudy or smelly aquarium?

If you have just changed the filter cartridge, air from the sponge may be trapped inside. Twist the bubble tube and lift one side of the filter cartridge slightly to allow air to escape. You may need to do this a few times.

If the filter cartridge is filling with air the air stone may have become blocked and caused a small air leak. Removing the air stone will solve this and start the filter working again. Without the air stone the filter will be slightly noisy so we recommend putting a new one in as soon as possible.

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