I'm just curious.........I keep a small carbon filter running on my 20 pretty much all the time. I change the carbon twice a month and the filter usually isn't too nasty. What I'm seeing lately is a little hair algae......not a lot but enough to make me wonder if I should just run the carbon for a week or so with fresh carbon then take it out, change the carbon and put it back in once a month for a week. I am running my pos skimmer full time and have about 45lbs of LR in a 20g do I need this extra filtration provided by the carbon? No Ro Di yet cause my budget this month wouldnt allow for me to buy it.



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