20g is fine  I have 2 20g that I use for tank transfer method they work great, check out kijiji or used stuff is always a good place for setting up a at systems no sence breaking the bank
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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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