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Evaporation rate lately in tanks/sumps.

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All my tanks all have lids but one - my largest. And in the past 4 days I've lost about the equivalent of a water change due to evaporation. I had to remove 20% today and replace it with 40%!

On a semi related note, I normally put in about a tablespoon of salt in each 40L change. With the amount I'm losing due to evaporation, I did not add any salt today, on the premise that when the water evaporates, the salt remains. If I continued adding salt each top up, it would result ultimately in a saltwater tank: fresh water only evaporates, the salt does not. Thoughts...?

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