yea i think the rw-4 would be too much for your 12 gallon
id stick with the 2 240 hydro for now see how that works for you
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Current tank---125 gallon mixed reef 60 gallon sump, Reef octopus nw200 skimmer, Rapid LEDs, Maxspec gyre, Mp10s, Fuge, Biweekly 20% WC, QT everything
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