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They realistically serve the same purpose. Much of the nitrates and phosphates in our tank come from uneaten food breaking down and other detritus. A roller mat/filter floss/sock catch this material before it is able to become nitrates and phosphates IF the reefer follows up in the case of floss and socks. The rollermat kind of takes the reefer out of that loop and removes that stuff for them automatically. “Chicken and the egg” kind of thing. A scrubber doesn’t actually remove anything. It consumes nitrates and phosphates and uses those resources to grow more algae. This means it’s still the responsibility of the reefer to harvest enough algae periodically and export it from the tank to actually “remove” nitrates and phosphates but not too little, which will cause nutrients to be quickly depleted to the point of starving the tank’s inhabitants or too much, which might cause the algae to not be able to handle the nutrient load until it grows sufficiently. Technically it’s “you” removing nitrates and phosphates. It can be tricky to determine the “balancing” point between too little and too much algae.They have separate purposes !! , the roller Matt is mechanical filtration and the algae scrubber is nutrient exportation . I’ve never felt the need for a roller Matt , to me it’s another invention to sell you replacements . Socks and or filter fiber works well and with the socks can be cleaned . The scrubber looks like too mech work to maintain but I here are effective at removing nitrates , phosphates to some degree but a refugium to me is more manageable if you have the room .
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