How to Install a Hang-On Fish Tank Filter

Hang-on fish tank filters are one of the most popular varieties of aquarium filtration. Undergravel and cannister filters are both difficult to maintain and less effective. It is important to install a hang-on fish tank filter properly to ensure maximum efficacy and ease of care.

Install a Hang-On Fish Tank Filter - Materials Needed

Purchase a fish tank filter that is rated for the amount of gallons your aquarium holds. This should be stated on the box. Most fish tank filters include all necessary hoses and tubes for the filter, but, if you have a particularly tall or long fish tank and want a greater mix of water, purchasing extra tubes or hoses is recommended.

A plastic fish tank hood can be cut with a normal hacksaw or even a large pair of sheers. This is necessary to fit the filter waterfall section into the back or side of the aquarium.

Install a Hang-On Fish Tank Filter - Set Up

Cut the appropriate opening in the hood of the fish tank where you want the hang-on fish tank filter to be. This should be in an accessible spot on the back or side of your aquarium. Access to an electrical outlet is needed.

Rinse all the filter components in clear water to remove any dust from the packaging. Construct the water intake tube as directed by the manufacturer and slip the large groove at the bottom of the filter over the wall of your aquarium.

If your aquarium is very tall or long, add more tubes to move the water intake area further away from the filter itself. You can purchase additional tubes from pet stores or filter manufacturers. Straight tubes and elbow bend pieces will be needed for a long tank, such as a standard 55 gallon rectangular aquarium.

Install a Hang-On Fish Tank Filter - Final Steps

Once the fish tank filter and all necessary tubes are attached to the edge of your aquarium, it is time to insert the filter media and turn it on. The filter may come with a plastic and cotton cartridge that is made to be inserted into the side of the filter, or you may have to purchase the separately. Be sure to get the type that is made for your particular brand and size of fish tank filter.

The first time you turn on the hang-on fish tank filter, you will have to prime it with some tank water. Do not use tap water unless you treat it with anti-chlorine chemicals or allow it to sit out for forty-eight hours before use. The best bet is to plug the filter into the electric outlet and pour a large cup full of tank water into the filter itself until the motor begins to pull water on its own.