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Old 08-13-2017, 11:47 PM   #1
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Corals vs refractometer

So I don't know if I should add more salt water to my tank or freshwater. My refractometer says my salt is low but when I added salt all my corals shrunk up. When I added fresh back in they started to come back. So I don't know if I should judge on my meter or my corals reaction. My meter says I'm at a salinity of 23.
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Old 08-14-2017, 12:01 AM   #2
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Recalibrate it. You're adding sw right not just straight salt to the tank?
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Old 08-14-2017, 12:36 AM   #3
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Corals vs refractometer

Yes, salt water. And I don't know how to recalibrate it. All I can do is hope that the tank is not to salty until I can work on it tommorow afternoon. I'll probably bring it to my lfs and see if they can calibrate it for me.
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Old 08-14-2017, 01:17 AM   #4
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Get ro/do water and rinse it off. The. Use it to calibrate.
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Old 08-14-2017, 01:01 PM   #5
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this may sound like a odd question but it has been done,
have you done any water changes lately. I have even done this myself I forgot to mix in the salt to the ro/di to put back into tank ,

another thought do you have a hydrometer to compare readings of both .
you say you get a reading 1.023 that still is in the safe zone ,

just remember raise the salinity slowly when you do get to that point so you don't shock the fish or coral
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Old 08-14-2017, 03:44 PM   #6
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Ok. And my saltwater is already premixed at my lfs. I'll try the hydrometer as well. I think my issue was I used a lot of tap water to clean off my refractometer and even though I dried it my results kept showing my water was to fresh. When I get home I'm going to rinse it off with ro/di water and use my hydrometer. Hopefully it's not to salty to do any real damage, but I would have seen a reaction from the corals if it was.


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Old 08-14-2017, 03:46 PM   #7
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Personally, I've seen my coral at their best at about .25, I've held it before at the .23 range but they just didn't extend that much
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Old 08-14-2017, 05:15 PM   #8
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Ok so I just checked everything. My hydrometer said I was at 1.023, my refractometer said 1.021. So I went a head and took water out and added salt in. I'm waiting a bit to let it all mix to see how everything is doing


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