The first thing I would do is determine the average amount of evaporation per day. I replace about 5 gal a day on my 240gal. I replace it by drip method in order to keep the sump water level constant. Before I change the water I make sure the water level is the same.
I assume what you mean by continuous water change you remove a certain amount of water and then at the same time replace it with new water. I really don't think this is practical nor that beneficial because you would also remove a certain amount of new water as well.
If I was this concerned about continuously new water I would change 15 to 20% of water a week, all the while keeping the evaporated water replenished.
You may already know this so forgive me if I didn'tn help any.
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