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Old 01-25-2010, 09:13 PM   #1
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1.020 Salinity

Like an idiot I never calibrated my refractometer when I got it. Just did it today and realized my salinity is at 1.020. The fish and cuc are doing fine, so it seems. Could this be a reason why there seems to be a loss of coraline algae in my tank and not much life on the live rock? I was thinking of trying to get the salinity back up to 1.026 gradually by adding saltwater to top my system off instead of just ro water. Would this be ok?

Any other suggestions would be greatly appreciated. I'm such an idiot
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Old 01-25-2010, 09:53 PM   #2
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I'm not sure on your questions, but there is an LFS by me that has a specific gravity of 1.018! So I am not surprised your fish are doing fine.

The only thing I could see with the top off thing is that rate at which you change it. How much of your tank usually gets replaced each day? Maybe you could put in instead of RO water like 1.01 water and then it will slowly go up?
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Old 01-25-2010, 11:16 PM   #3
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I'm not sure on your questions, but there is an LFS by me that has a specific gravity of 1.018! So I am not surprised your fish are doing fine.

The only thing I could see with the top off thing is that rate at which you change it. How much of your tank usually gets replaced each day? Maybe you could put in instead of RO water like 1.01 water and then it will slowly go up?
I replace 1 gallon every other day.
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Old 01-26-2010, 01:20 AM   #4
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I would say topping off with saltwater is OK. That's what I've done when I've needed to bump my salinity up.

How big of a tank are we talking about? 75g or so?
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Old 01-26-2010, 09:28 AM   #5
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Yup, its 75 gallons.
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Old 01-26-2010, 10:01 AM   #6
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So your topoff is 1 gallon per day?
Great, mix that up to 1.030 SG and use that for your top off till the tank slowly comes back up to 1.025.

Fish do quite well at 1.020, corals need it higher (as you found out).

How did you calibrate your refractometer? Did you use a solution or DI water?

I generally do both and check it quarterly.
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Old 01-26-2010, 10:04 AM   #7
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Distilled water would calibrate.
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Old 01-26-2010, 10:55 AM   #8
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Distilled water would calibrate.
I used my RO water to calibrate. Is that ok or should I get some distilled water?
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Old 01-26-2010, 11:58 AM   #9
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I dunno. CMOR??? You said it. Does it work?

tdubrow - I'd get some anyway. You can use the rest in the iron. Keeps the hard water stains at bay.
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Old 01-26-2010, 01:37 PM   #10
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same thing.. pure water (assuming 0 tds RO)
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