How long has this aquarium been set up? I am assuming it is 30 gallons or larger (size of Aquaclear).
If it has been 6 months or so, and the tank has substrate, plants, rock,wood, etc.,
you should have sufficient biological bacteria in the tank, and I wouldn't worry about cycling the filter.
The Aquaclear has a leveling cam, on the bottom.
Make sure you have it tilted as much as possible towards the aquarium,
and have your sponge/ media set as deeply into the filter as you can.
If you don't, as it saturates with waste, it can overflow, and dump several gallons of water on the floor! (ask me how I know
Not dissing Aquaclears, the best HOB on the market IMO, and no expensive cartridges to buy!