The ornamental design for an aquaponicsfishtank, as shown and described.
FIG. 1 is a reduced top, front, left perspective view of an aquaponics fish tank showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a reduced top, rear, right side perspective view therefor.
The broken line in the drawings is included for the purpose of illustrating portions of the aquaponics fish tank and forms no part of the claimed design.