I do it all the time. Just have a 25 gal full of ro water beside the tank and instruct the person to just add water up to the line in the sump ( use black marker to draw line on sump glass). Turn skimmer down a notch ( less chance of overflow) and only feed every other day. Don't add any additives during this time. After 3 weeks, you might come home to a tank that's got a lot of film algae on the glass, but everything else should be ok.
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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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