Re: Water evaporation It's probably a good idea to top off twice once a day. If you're topping off with 10 gallons every 2 days or so, your SG is going way high; maybe dangerously high. That's too much of a swing in the SG for specimens to handle in the long term; in my opinion. Yes they have water topoffs connected to either a RO/DI unit, or a water reservoir.
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Onward through the fog!
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