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Old 12-17-2013, 12:36 AM   #1
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Natural seawater high sg?

Hey guys. I'm new to reef keeping, I originally had a 30L nano tank but with what I want to put in there, we quickly realised we needed something much bigger. Since upgrading to a 150L (in which I have a bubbletip anemone, two ocelllaris clowns, a banded shrimp, a saddleback puffer, a psychedelic mandarin, a large plate coral, a bunch of duncanops and a brain coral and a strombus snail), we bought natural saltwater to fill it, as well as got 200L to store for water changes. My question is, I have a refractometer, and in my baby tank I always had my sg at 0.026 like everywhere suggests, but when I tested my natural saltwater (which is taken from the coast along our GBR in Australia) it is 0.03 sg. As this is natural water I don't want to tamper wih it by adding freshwater, and everyone seems happy at 0.03 - I acclimated them all over two weeks ago and no one seems stressed or different, and the corals are all bright and blooming/colourful every day.

My question is should I try pulling this back to 0.026 or just leave it? I'm inclined to want to keep it at natural levels, I just want to make sure it's not going to hurt anything in the long run.
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Old 12-17-2013, 08:21 AM   #2
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Is it possible your refractometer needs to be calibrated again ?
The only other thing I can think of is if it's been open to evaporation the water evaporated raising the salt concentration .
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Old 12-21-2013, 05:12 PM   #3
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So I just checked my refractometer and you were right, it was out by about 0.05! Haha whoops! **** n00bs :P
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