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Old 04-08-2014, 12:47 AM   #1
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Water change shocked fish?

Hi, I did a 20 gallon water change on my 65 gallon FOWLR today because it's ammonia and nitrites we 0, but nitrates were 20ppm and the salinity was a tad high at 1.026.

I finished the water change and checked my parameters to be 0 for ammonia and nitrites, but 10ppm for nitrates (yay it lowered). My salinity had dropped to around 1.023 and a half. Temp was the same as usual. (78 at night and 80 during the day) Ph was 8.0 but it tends to fluctuate between that and 8.2.

My one spot foxface seems to be freaking out and swimming up and down the glass! My other fish are fine and sleeping, but not the foxface! Do you think this is stress, or is something up with the water? Any tips on water changes to avoid this problem? I really hope he will be okay
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Old 04-08-2014, 04:12 AM   #2
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Not sure how much you know?

If the salinity keeps rising its most likely evaporation. Top up with freshwater. Normally RO.

When I transitioned my puffer fish from shop to home it was suggested to me to keep the salinity within 0.001 per day and increase gradually until the desired level was reached. This allows the bacteria to adjust with the salinity.

The sudden shift could be causing osmotic shock/stress.

Regular top ups should help keep salinity constant. With the puffer fish I usually add RO twice per week and change matched water on the weekend. Only adding as much as has evaporated.

If you started at 1.026 and finished at 1.023 your clean water potentially was only 1.017 perhaps less? That's a considerable difference in Grammes per litre of salt between tank water and new water.
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Old 04-08-2014, 07:12 AM   #3
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Not sure how much you know?



If the salinity keeps rising its most likely evaporation. Top up with freshwater. Normally RO.



When I transitioned my puffer fish from shop to home it was suggested to me to keep the salinity within 0.001 per day and increase gradually until the desired level was reached. This allows the bacteria to adjust with the salinity.



The sudden shift could be causing osmotic shock/stress.



Regular top ups should help keep salinity constant. With the puffer fish I usually add RO twice per week and change matched water on the weekend. Only adding as much as has evaporated.



If you started at 1.026 and finished at 1.023 your clean water potentially was only 1.017 perhaps less? That's a considerable difference in Grammes per litre of salt between tank water and new water.

The salt water was actually natural and at 1.030 so I had to use a lot of RO water to being it down. So you can only change .01 of salinity over an hour?
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Old 04-09-2014, 04:14 AM   #4
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0.001 salinity per 24 hrs.
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Old 04-09-2014, 07:18 AM   #5
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Just top off with salted water and the salinity will slowly raise. BTW, .026 is not high. It's normal range.
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Old 04-09-2014, 11:50 PM   #6
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0.001 salinity per 24 hrs.

Wow okay I had no idea it was that long
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Old 04-09-2014, 11:50 PM   #7
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Just top off with salted water and the salinity will slowly raise. BTW, .026 is not high. It's normal range.

So then what is considered high? I like keeping my salinity at 1.023 to 1.024
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Old 04-10-2014, 08:53 PM   #8
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And why do you like keeping it there? Natural sea water is 1.0264, so I like to try to mimic the ocean the best that I can. Naturally a point or two either way isn't going to kill things, but if you can make it correct, why not?
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Old 04-10-2014, 08:56 PM   #9
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And why do you like keeping it there? Natural sea water is 1.0264, so I like to try to mimic the ocean the best that I can. Naturally a point or two either way isn't going to kill things, but if you can make it correct, why not?

I keep it at 1.023-1.024 because I had read that is was best to keep it at 1.022-1.025 so I just averaged it out to the middle. I thought also that if you kept the salinity lower, it helped with disease? Is that true?
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Old 04-10-2014, 09:00 PM   #10
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No. Not unless it's way low, like 1.016, and corals aren't going to be happy in that environment. Some stores keep a low SG in their fish systems to keep ich from surfacing. It's not a cure by any means, because as soon as you bring said fish home and put it in your water, blamo! Ich everywhere.
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