i run a useless prism skimmer on my 29gal tank, run it full bore and never get any skimmate but it does keep oxygen in the water for my fishies, my 50 gal has only a turf scrubber in the sump, no skimmer at all, so far i have had great luck keeping the big 3 undetectable in the tank and my sps is growing, 70 gal total volume and only a 10 gal waterchange every month or so
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