Depends on what you mean by adequate filtration.
To me, its the invisible stuff that is the most worrisome, and that stuff (dissolved organic carbon, proteins, acids, etc) tend to collect, and build up on the surface, so in that way, to me surface skimming is preferred.
Some people think aesthetics are most important, and the removal of particulate, mulm, and fish feces are the most important things for filters to remove.
To me, substrate vacuuming is is best for removal of these things, not filters.
To me, its the invisible stuff that is the most worrisome, and that stuff (dissolved organic carbon, proteins, acids, etc) tend to collect, and build up on the surface, so in that way, to me surface skimming is preferred.
Some people think aesthetics are most important, and the removal of particulate, mulm, and fish feces are the most important things for filters to remove.
To me, substrate vacuuming is is best for removal of these things, not filters.
Ran the 5 gal sock filter last night to test flow...my 250 gph pump doesn't faze the huge sock filter one bit.
Another question, can you get adiquate filtering from surface skimmers?