You could do a shrimp goby pair like the candy cane shrimp they are like an 1" long and one of the small goby's randals I think only get 2" I can't remember but there are some small ones my bro has a 5 gallon with them awesome little guys mess up the sand a lot but cool to look at
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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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