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The ornamental design for an aquarium filter, as shown. |
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FIG. 1 is a top plan view of an aquarium filter showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a bottom plan view thereof; and
FIG. 6 is an exploded perspective view thereof.
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