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Old 06-05-2003, 11:27 AM   #1
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Dead Tang

I came home last night and found my yellow tang lying at the bottom breathing heavily. I checked the water parameters. They are as follows:
PH 8.2
ammonia 0
Nitrites 0
Nitrates 40
Spec Grav. 1.022
He was dead when I woke up. I don't know what happened, there were no visible signs of disease. I did add some rock to the tank yesterday, but all the other fish are fine. Wouldn't is all of them if I accidentally introduced a contaminant? Any ideas what could of happened???????
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Old 06-05-2003, 05:14 PM   #2
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I would say maybe the high nitrates would have something to do with it. Nitrates should be at 10 or less. Sorry for your Loss
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Old 06-05-2003, 05:23 PM   #3
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Nitrates may have done it, I am not sure. Sorry though.
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Old 06-05-2003, 05:30 PM   #4
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My percula clown (had for 3 years) died yesterday afternoon too for seemingly no reason as well
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Old 06-05-2003, 05:36 PM   #5
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was it a full moon last night? 8)
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Old 06-05-2003, 06:16 PM   #6
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My guess would be the rock not the nitrates, 40ppm is not that high even for a fish only tank. Whether is was a temporary ammonia spike that passed by the time you tested or a contaminate it is difficult to tell. I would never add rock directly to the tank without some form of QT period in a bucket, testing to tell how cured it is. Then there always remains the possibility of an unknown cause the hobby is not familiar with yet.

Can you describe your system a bit (size, filtration, etc.)
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Old 06-05-2003, 08:35 PM   #7
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It couldn't have been die-off from the rock because it was dry base rock. I just needed a few to fill in gaps. I rinsed it a million times-even with the water hose at full blast so I dont know whats going on. I done a 20 gal water change and replaced the filter media but the nitrates didnt go down at all! Any suggestions for decreasing the nitrates. Tank is a 75 gal, wet/dry filter-can't remember specs om filter but it was built for a 125 gal tank, about 70 lbs LR, only fish now are 2 percula clowns, 2 blue devil damsels, 2 emerald crabs, various snails and hermits. I dont have a skimmer yet.
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Old 06-06-2003, 10:15 AM   #8
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Quote:
water hose
What kind of hose? Outside garden hose type?

To reduce the nitrates, a skimmer will help. A wet/dry filter is a nitrate factory, as long as that is in place it will always contribute to nitrates. I would begin phasing it out by removing media and implementing a deeper sand bed or complete DSB with detrivores.
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