the siphon and skimmer. everything else (GFO, Algae, ATS, whatever) just goes after the phosphates when they become inorganic. the siphon and the skimmer are the only methods for removing phosphates while they are still organically bound. everything else, is a day late and a dollar short to the phosphate party. remove the detritus, then you are removing the material that when decomposes allows phosphates to become inorganic. go after the source of the problem, do not mask it.
skimmers do remove phosphates, just not in the way that most people think. a skimmer does not remove inorganic phosphates, it removes the phosphates while they are still organically bound within bacterial bodies, algae, or any organic material that is pulled into the skimmate.
G~