[QUOTE="specialized002, post: 7591609, member: 48413 filters need additional mechanical filtration[/QUOTE]
Hello; Having more mechanical filtration is OK but, in my experience, a portion of the total. I guess that if you can afford more and do not mind fooling with it, then go for it. I do not suppose you can have too much mechanical but I don't think it will replace the other portions of tank upkeep.
Some of the other stuff includes regular substrate vacuums during water changes and regular water changes.
Another practice that has been of benefit for me is to reduce overall feeding of mature fish. I use to feed too much too often. This led to many of the issues that are mitigated now by reduced feedings and fasting days each week.
Perhaps the bigger improvement of water quality for my tanks has been the move to light stocking densities.