Aquarium filter cartridge element

FIG. 1 is an isometric view of an aquarium filter cartridge element incorporating our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken lines are for illustration only, and form no part of the claimed design.