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Old 07-28-2010, 04:09 PM   #21
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Hi Mark

Are you using the same salt since the move,could it have been contaminated with anything?also how old is the new place as some older places still use lead piping for mains water which can't help,just guessing now though.
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Old 07-28-2010, 05:13 PM   #22
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I have only read through the last couple of posts so just ignore this if it has already been tried. If there is something in your salt mix and it somehow got contaminated i would try running some activated carbon for a couple days to try and pull what ever it is out of your water. Might help the fish that are in the tank. Sorry for all your troubles. Hope you figure it out.
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Old 07-29-2010, 06:28 AM   #23
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Thanks for the replies guys. My Royal Gramma gave up after approx 3 hours of deep breathing on the bottom; my green goby was actually okay and not affected (thought it was), and my yellow clown goby was breathing extremely fast, in the same spot, for almost 5 hours. This morning, I'm pleased to report that he now seems absolutely fine. I'm really pleased about this, as he's now the only surviving fish from my original tank. I just need to get to the bottom of this now before the next waterchange!

Yes, I use the same salt I always have. I guess it could have been contaminated somehow (perhaps a bad batch?); it's stored in an air-tight container under the sink, no damp or anything, dry, room temperature. Is there any way I can test if there's a problem with the salt?

The house is approx 20 years old; not sure about the piping. Wouldn't anything like that (e.g. metals) show up in the TDS test thought? If not, again how can I test?

Pat: I'll run carbon now, thanks.
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Old 07-29-2010, 07:34 AM   #24
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Hi Mark, I really have trouble reading long post so I only scanned over the details.When you moved to the new tank did you reuse the sand? That's the only thing I can think of is when you do a PWC you might be stirring up the sand and releasing toxins that in time is taken out by your filter. Pats Idea of running carbon is spot on so give that a try.
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Old 07-29-2010, 07:50 AM   #25
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Hi Mark, I really have trouble reading long post so I only scanned over the details.When you moved to the new tank did you reuse the sand? That's the only thing I can think of is when you do a PWC you might be stirring up the sand and releasing toxins that in time is taken out by your filter. Pats Idea of running carbon is spot on so give that a try.
Hi, no I didn't reuse the sand, I used brand new ceramic media (due to the filter, I would have preferred live sand), which seems to be doing its job as there's no ammonia/nitrites, although nitrates are high at 40ppm, but consistently so.

I siphon out the tank water when I waterchange, and barely agitate anything (e.g. the substrate), but I guess if there's any food/detritus contained in the substrate/in the rocks etc., that this could be slightly agitated during a waterchange. BUT, would this not show up as ammonia, either immediately or over a couple of days?
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Old 07-29-2010, 04:44 PM   #26
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Yes, but it could also be a metal that your test is not made to detect. Where did you get the sand from? So many questions, but that's the only way to weed out any one thing.
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Old 07-29-2010, 06:15 PM   #27
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I find it strange that this happens when you do a PWC. Id suspect either the salt or the water. Maybe get some new salt and see if it happens again? Maybe your RO/DI filters need changing? Maybe the TDS meter isnt reporting whats really there?

Id try new salt and some bottled water (DI) and see if things improve. That way you know its not the salt or the water.
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Old 07-30-2010, 06:25 AM   #28
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I guess it is either a problem with the salt, my RO water, or something that gets stirred up in the tank (in the media/rocks) when I'm doing a bit of cleaning. Although I would expect this to show up as ammonia?

The RO filters should be fine (only a few months old), but yes you could be right about my TDS meter. I'll recalibrate it.

Are there any other tests I should be doing to look for any other contaminants in either the new salt or the tank water?
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Old 07-30-2010, 02:19 PM   #29
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What temp. is your tank at?
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Old 07-31-2010, 10:49 AM   #30
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what temp. Is your tank at?
27-29°c
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