Can somebody throw some advice my way about the biological filter... obviously it should not be disturbed too much, but my pump flow is somewhat reduced so I imagine I need to perform a partial clean of the filter.
The filter is an external canister type layered from bottom to top with:
Bio-Balls, Fine filter pad, Ammo Chips, another Fine Filter Pad, Filter Wool and then a Course Washable Screen Filter on the top.
Should I remove and replace the filter wool and wash the top screen filter media without disturbing the Ammo Chips and Bio Balls? Also, is this the correct way to have the filter media set up?