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Old 10-03-2006, 09:16 PM   #1
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Big problem

I have a problem. I just got back from the LFS and I bought a coral. I asked the guy what he kept their salinity and he told me, 1.025. Then he tested it with a Deap Six hydrometer in front of me

I get home and I test the water with my refrac...1.030!

I also have a deap six hydro as a backup. When I first got my tank I calibrated my refrac and my hydro was way off so I trusted the refrac. My refrac reads 1.025 for my tank and 1.030 for theirs. My hydro test theirs at 1.025!!

I grab my hydro and it says my tank is 1.020. I didn't have any distilled water on me so I tested some tap with the refrac and it gave me 0 but so did the hydro.

Now what? If my tank is 1.020 how are all my corals and fish ok, and if I have to raise it, should I just not to topoffs for a few days until I get my tank up higher? I thought refracs were suppose to be more accurate?

Thanks
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Old 10-03-2006, 09:29 PM   #2
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I would trust your refractometer reading of 1.025 for your tank, if it were me. It's possible that the hydrometers have the same error in measurment. My hydrometer has never been accurate...save for when I first got it. If everything looks fine, nothing to worry about.
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Old 10-03-2006, 09:30 PM   #3
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I would trust the refractometer. Go by it for yours and his. That is the most reliable. If yours is low than top off with salt water instead of FW till yours is at desired level. Forget the hydro and trust your refrac. If your water is 1.025 and his is 1.030 a slow drip acclimation will be needed to bring it to your tank level.
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Old 10-03-2006, 09:37 PM   #4
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I think that this is my fault and I made a big mistake while calibrating my refrac.

Not only that, I made another big mistake and I did not acclimate the coral or serpant start I got. I am keeping an eye on them. I thought my salinity was the same. Live and learn

When I calibrated with distilled water, I set it to the bottom line which I now realize reads 1.000 Was it suppose to be set below the bottom line?

I know that refracs are more accurate but I thought salt water animals couldn't even live in 1.030?
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Old 10-03-2006, 09:45 PM   #5
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Distilled set at 1.000. They could make it for a little while but the problem is a big salinity change all of a sudden. That is the purpose of the Drip acclimation to bring it up or down slowly to yours. Good Luck
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Old 10-03-2006, 09:51 PM   #6
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I found my hydro was about .00500 off, when compared to my refracto, so that seems about right, unless my math is terribly wrong. I agree with DT, trust your refracto IF YOU calibrated it with distilled water (I wasn't yelling, so please do not take it that way).

Quote:
Originally Posted by Mike469
set it to the bottom line which I now realize reads 1.000
That should exactly where you want it, matched up with the line. I had the exact same question.
Quote:
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I thought salt water animals couldn't even live in 1.030?
To put you at ease, think of a lagoon, that the water slowly evaporates, causing the salinity to slowly rise. The critters in there can live for a while or even possibly adapt. I think you should be ok. I am not 100% sure, but I believe corals like a higher salinity....somewhere around 1.024, or so. I don't think 1.030 is terribly horrible for them, but I would reduce the salinity. Hopefully, one of the experienced "reefers" can help you more efficiently.
I think you are doing a great job! I know you are great on the FW side, just don't overthink too much and keep the questions coming. I believe I told you one time that I might be needing your help on the FW side (dang all you folks with the cool looking decos and backgrounds on the FW side! LOL!)
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Old 10-03-2006, 09:54 PM   #7
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refrac

What is the difference with testing distilled with tap?

Tap should not have any salt in it?

I don't have any distilled to recalibrate my refrac on me.
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Old 10-03-2006, 10:03 PM   #8
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Quote:
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What is the difference with testing distilled with tap?
I don't think I could list all of the differences, it depends on where you live and what the city puts into the water. I believe, distilled water is, for the lack of argument "pure" water. It goes through a process that "should take out all the contaminants". Ideally, it should be 100% H2O (of course, it probably really isn't). I bought mine at CVS. Tap water has other contaminants in it...possibly even a little salt.... If there is a science person out there, they can possibly explain a little better. My suggestion, get distilled water and calibrate that way.......you can even calibrate your hydro...add the distilled water, mark where the arm rests and that should be your 0.....

I think the easiest way...get distilled water and calibrate....
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Old 10-03-2006, 10:28 PM   #9
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refrac

Ok. Thanks for everybodys help as always.

I am not going to try and alter anything right now. If everything is living fine, I want to keep it thayt way.

Tomorrow I will go get some distilled water. If it is off, I will slowly fix it. Even if it is a little low, soft corals should probably be ok.

I will let you know what happens.

I don't doubt what Devilshirts said about them both being inaccurate at the same reading.

Thanks again.
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Old 10-03-2006, 10:37 PM   #10
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Yes, they can live in differing salinities, but like the other guys said, it's stability that you want. If your tank measures at 1.025 now, I wouldn't worry about a thing. Always drip acclimate, even if you are 100% sure salinities are the same.
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