for clear water?
put filter floss (fine) in your filter, and get a UV sterilizer, put accu-clear clarifier, also get filters like fx5 and marineland c series.
Intelligently designed, adequate mechanical filtration.
It doesn't matter what brand or type of filter or media.
It doesn't matter if it is a sump an HOB or canister (powered or unpowered).
If it works,it works.
Additives are just a band aid.
$.02