I use a combination of three: i) skimmer, ii) Refugium with Chaeto and iii) Rollermat. I am very slowly tuning all three to get where I want to every time I add fish or change feeding. Right now and am at 20 nitrates and 0.12 phosphates with the skimmer on 24/7 dry, the rollermat on for 18 hours a day and the fuge on for 20 hours a day. I feel I am reaching capacity in fish and/or feeding since all I have left to "tune" is 4 more hours in the fuge and 6 more hours in the rollermat. The chaeto grows well, I export a ton every 14 days.