The ornamental design for a tubecandle, as shown and described.
FIG. 1 is a perspective view of a tube candle showing my new design with the subulate cover removed for clarity of the disclosure.
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is another perspective view of the tube candle in its end use with a subulate cover on the candle. (The chain shown in broken lines on the sublate cover forms no part of the claimed design.)