I thought those were for freshwater tanks...like to help skim leaves off the water surface.
a saltwater protein skimmer uses a collection cup...I googled your 3535 Surface suction extractor, and it doesn't look like a protein skimmer...just a tube that catches plant leaves and other floating surface debris..and might remove that later of film a freshwater tank sometimes builds up.
for actual protein skimming...I think it's useless. a real protien skimmer uses foam fractionation to ionicly bond
DOC's to the micro bubbles in the skimmer. THe
DOC's are both attracted to, and repelled by water (sort of like a magnet with polar ends). The surface of an air bubble satisfies both needs, and thus the
DOC's latch on to the bubbles, which rise and burst in the collection cup, trapping the
DOC's for removal.
The more contact time with the bubble in the chamber, the better the skimmer. The smaller the bubbles...the more bubble surface area...thus...the better the skimmer.
That extractor will keep your water clearer though as it'll collect the larger particle debris.
