Hmmm, 20% after change every 2 weeks is only 5 gallons. Seems like a lot of extra work and expense you're considering for such a small tank.
I would only consider an automated system for a tank over 100 gals
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Last tank was 210 reef with 90 gal sump
120 , lps. 2xKessil A350W Tuna Blues, 2xvortech mp40 for flow,aqualogic 1/4 hp chiller, 160 lbs live rock. sohal, , pair of percs,flame dotty back , royal gramma, pair of black percs, niger trigger, mandarin
55 corner bowfront freshwater, African cichlids kessil a350
30 gal 36x36 coffee table fish tank. 3 red ear sliders.
5.5 gal nano, live rock, arrow crab, baby perc, firefish.
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