A frozen food aquarium feeder controls the melting and dispersion of frozen aquarium food. The feeder includes a rotatable first cylindrical column having a floor/ceiling including a set of passages and a rotatable second cylindrical column having a ceiling/floor including a matching set of passages. The cylindrical columns are assembled with an interference fit to a round bracket allowing each cylindrical column to be rotated with respect to the round bracket. The floor/ceiling of the first cylindrical column may reside against the ceiling/floor of the lower column, and the cylindrical columns may be positioned to provide a desired overlap between the passages to control the passage of melted food from the first cylindrical column to the second cylindrical column. The feeder may be positioned with the first cylindrical column extending above the aquarium water line, and ports in walls of the cylindrical columns may be positioned to intercept aquarium currents.
