A clogging indicator for a fish tank or aquarium comprising a transparent vertical tube with a float positioned therein. The indicator is designed to sit on the outside of the tank and the filter itself. The water level in the tube is lowered and raised according to the amount of water with a rear chamber of the filter. Indicating marks are located on the tube to visually display normal or clogged operation. Backup water from a clogged filter will raise the water level in the rear chamber and thus also the indicator tube. As the water level rises, the float raises toward a warning indicator mark to indicate the need for filter changing.

 
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