I don't know what media Aqueon uses in the HOB filters. But in general if it has a foam block, you should always rinse that off in some tank water so you don't destroy the bacteria that has colonized it, and if it has a carbon or charcoal section, that can be replaced at least monthly. Every 3 months or so you should disassemble the HOB filter assembly and clean the pump and impeller, it'll get pretty slimy.
It is up to you to decide if you want to use preloaded filter cartridges from Aqueon or buy a zippered nylon bag and refill with your own carbon. Fwiw, pelleted carbon is much safer for your fish than the granular type, always rinse it well before you use it so the fines don't get into the tank. ROX 0.8 carbon is expensive but doesn't require much and is THE safest carbon to use in a marine aquarium. I mention this because some carbons/charcoals are coal based and are very harmful to a lot of the fish we keep, tangs and angels in particular.
