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this is how I did mine in my laundry room it's just Y you would use on your garden hose outside with the shut off valve for each side. Got it at Lowe's. Oneside is rodi and the other is my washing machine.
Sand sifting gobies usually starve after a while. If you want something to stir the sand up get a pistol shrimp and watchman goby they are cool to watch and will keep the sand bed stirred.