Rubber Couplers can be used in your pond plumbing anywhere that you might require a disconnect.
Joined easily with steel clamps, these couplers provide an easy solution to disconnect the piping at a particular juncture in order to perform maintenance, remove a clog, etc.
You should stop feeding your aquatic plants about a month before the first frost in your area. Even in areas that don't normally have frost, plant growth slows in the shorter, cooler days of the fall and winter months.