The ornamental design for stationery organizer in the form of an aquarium, as shown and described.
FIG. 1 is a perspective view of a stationery organizer in the form of an aquarium showing my new design;
FIG. 2 is a front view of the new design;
FIG. 3 is a rear view of the new design;
FIG. 4 is a left view of the new design;
FIG. 5 is a right view of the new design;
FIG. 6 is a top view of the new design;
FIG. 7 is a bottom view of the new design;
FIG. 8 is a perspective view showing the design in opened position;
FIG. 9 is a perspective view showing the design opened with unclaimed articles therein; and,
FIG. 10 is a perspective view showing the design closed with unclaimed articles.
The broken line showing unclaimed articles in the trays and fish in the aquarium in FIGS. 9 and 10 are included for the purpose of illustrating environmental matter and form no part of the claimed design.