From: dlzc1@cox.net   
      
   Dear aggi...:   
      
   On Thursday, September 14, 2017 at 9:55:11 AM UTC-7, aggi...@hotmail.com wrote:   
   > I know this thread is old, but I was curious of this   
   > same question.  I have two fish tanks, one 20 gallon   
   > fresh water and one 40 gallon salt water.  I add   
   > about 2 gallons of fresh water to my saltwater tank   
   > every few days.  I do not have to add freshwater to   
   > my freshwater tank but once a month when I clean it.   
   > The tanks are pretty much side by side in the same   
   > room so they endure the same temperature daily.  Why   
   > would so much water evaporate from the salt water   
   > tanks.  Anywho, any feedback is greatly appreciated.   
      
   The answer is here:   
   https://www.thespruce.com/the-importance-of-proper-aeration-2921460   
      
   Arguments that water does not preferentially evaporate from a free saltwater   
   surface vs. a freshwater surface are moot.  Henry's law states that more gas   
   being bubbled through the water, as required to get / keep the oxygen levels   
   up to required levels,    
   will necessarily carry off more water vapor.   
      
   If you aerate your freshwater aquaria like you do your salt water aquaria, you   
   will have to add even more water to them.  And probably wear those fish out   
   trying to withstand the higher induced currents...  ;-) just kidding.   
      
   David A. Smith   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)