Air Manifolds are a very convenient, and necessary method of distributing air to where it is required, and manifolds also enable you to control the air supply.
These Air manifolds work in conjunction with an Air Pump allowing you to maximize your aeration output.
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.