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Old 05-23-2005, 05:14 PM   #11
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Originally Posted by SerLunchbox
depending on the fish, it may be enough to cause death
Tetras?
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Old 05-23-2005, 05:21 PM   #12
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Some tetra's are not hardy fish and can be delicate to pH swings such as that.
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Old 05-23-2005, 05:24 PM   #13
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Quote:
Originally Posted by Fishyfanatic
Some tetra's are not hardy fish and can be delicate to pH swings such as that.
Very few, if any, would be killed by a swing under .75 unless the tetras were already compromised.
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Old 05-23-2005, 05:29 PM   #14
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Some tetra's are not hardy fish and can be delicate to pH swings such as that.
Are you going to argue with ever post I make from now on?
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Old 05-23-2005, 05:34 PM   #15
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That is why I am so perplexed. 7.2 + 7.4 = 7.6 I tested all three twice with two tests (high range and mid range) for a total of four tests on each water source. Water in tank was 7.6 Water I gravel vacced out in food grade plastic bucket 7.2 (found a swordtail baby in it just now) 50/50 water still in culinary water storage jug 7.4 Change was made last night 9pm MDT. Tests were done this morning 9am MDT after overnight death of three fish. Previous change was one week before.
Just retested aquarium water...7.2!
These little guys appeared perfectly healthy before the change and when they were introduced to the tank it was around 7.8 Unless they all choked on swordtail babies I have no other explanition for the deaths. Only new tankmates are 3 small praecox rainbows added after last water change. Only recent death was a carpet surfing danio.
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Old 05-23-2005, 05:41 PM   #16
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I think it is possible that your test kit could vary slightly in results, since these kits are not as accurate as we might hope. It could be out of date, or been exposed to high temps, etc. to render it unreliable. There could even be a variation in the drop size of the reagent causing slightly different results. The accurate test kits/meters are extremely expensive and not typically what we use, and the AP kits are a good guide but that's about it.

I would not make any changes in your routine, which seems reasonable (you did not forget dechlor in the tap component of your PWC mix, right?) based on the results of a test kit. You are right to investigate, however, in the instance of fish death following PWC.

I would suspect other causes for the fish deaths, even if it is the "mystery" deaths that occur from time to time.
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Old 05-23-2005, 05:43 PM   #17
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I would suspect other causes for the fish deaths, even if it is the "mystery" deaths that occur from time to time.
I agree.
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Old 05-23-2005, 05:44 PM   #18
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Quote:
Originally Posted by Apocalypse_Gold
Water I gravel vacced out in food grade plastic bucket 7.2
OK, your results there could well have been affected by suspended decomposing biological matter stirred up by the vacuuming.

Quote:
Just retested aquarium water...7.2!
OK, lest say that your actual aquarium water was 7.6 (before you touched it to siphon, etc), and you added 7.4 water....that could account for a drop of 1-2 points....combine that with some decomposing material in your tank (wood/plants/?) and/or off-gassing and/or loss of buffering could drop the pH anopther point or so over 12 hours....so it may not be all that mysterious after all.
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Old 05-23-2005, 05:45 PM   #19
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Tap water went through carbon stages of my r/o filter and it sat for 24 hours so no chlorine (I've tested this before). Thanks for all your help. Just their 'time' I guess.
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Old 05-23-2005, 06:04 PM   #20
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It seemed like it could have been Old Tank Syndrome to me..
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