Your tank is pretty typical. Really the only thing you can do is put glass or acrylic covers on your tank top and sump but this can cause other problems: reduced light to corals, more cleaning to do, potentially reduced air water contact area.
Most reefers just deal with it and rig up an auto top off system that draws from a reservoir that you only have to refill maybe once per week.
Personally my system loses between 6-8 litres every day!
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