Easy, don't spill water. 
Well maybe not that easy. But, you can minimize the risk with carefull setup and good plumbing. I use a piece of carpet runner laid out in front of the tank when I'm servicing to catch the little drips.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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