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Old 09-07-2011, 02:00 PM   #11
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Am I wrong in saying that you should not top off with saltwater? Wont that drive up the salinity?
All depends in my book. If you test first and it is where you want it to be, I would top off with water that has close to the same salinity. If you use fresh, it will dilute what is in the tank resulting a low SG.
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Old 09-07-2011, 02:03 PM   #12
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Top off water for a saltwater tank should always be done with freshwater and then test for salinity after top off. That has always been my experience with salt tanks.
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Old 09-07-2011, 02:04 PM   #13
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Doesnt evaporation leave the salt in the tank? I am getting ready to start a SW tank, that is why I am asking..
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Old 09-07-2011, 02:06 PM   #14
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Salt content in tank leaves salt in the tank after evaporation so top off with fresh water should not change salinity very much. Making sure you are talking specifically top of and not water change!!
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Old 09-07-2011, 02:10 PM   #15
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well its all according to the store about the water, my work uses the one of the best salts on the market and we use it in all of our tanks at work from full blown reef to fish only. personally i buy premixed. saves alot of hassle. now about topping off its all according to what your trying to do. raise your salt levels or its just minor evap. now if you need to top off a light id use all ro
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Old 09-07-2011, 02:10 PM   #16
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Anyone correct me if I am wrong but partial water change should be done with saltwater of the same or pretty near the same salinity and top off from evaporation should be done with fresh water.
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Old 09-07-2011, 02:10 PM   #17
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That is what I thought TOPOFF is replacing evaporation. Water change you are taking out salt with the water, so you have to replace with saltwater.
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Old 09-07-2011, 02:11 PM   #18
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I agree that evaporation will leave the salt in the tank. If you have enough evaporation though, you salinity should be higher than you want. For that reason I would use fresh to get it back down. What I am saying though, is if you check it before topping off, and it is where you want it to be, topping off with fresh will lower it below what you want. If however, you top off with water that is close to what you have in the tank the salinity will remain the same.
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Old 09-07-2011, 02:14 PM   #19
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Makes sense. Sorry to jack the thread. On the original subject, being my first sw, I was going to buy the sw at first and then get my own ro/di system.
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Old 09-07-2011, 02:22 PM   #20
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Makes sense. Sorry to jack the thread. On the original subject, being my first sw, I was going to buy the sw at first and then get my own ro/di system.
Well, it all kind of goes with the original thread. LOL That is why I like to mix my own. Using premix from the LFS you are stuck with the specific gravity they mixed it at. If you mix your own, you can adjust to your liking/needs.
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