Jazzzz
Fish Addict
Is it really nessary to clean them if they maintain a good flow of water and water changes are done?
One thing to consider is what kinds of food you feed, and how much of it gets sucked into the filter intakes...basically depending on how much "gunk" is decaying in there you could be trapping rotting stuff that's dumping nitrates back into your tank water. So yes there is a good reason to give your filter media a rinsing now and again (aside from reduced water flow).