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Old 02-01-2006, 05:23 AM   #1 (permalink)
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Default Water change brings death

Last night I did a water change on the 75 gallon. On saturday after the meeting i picked up 25 Rummynose and 20 Hatchet fish from Pete Shepart. They were all doing great until i did a 50% last night.

Everyone else is fine, all the Hatchets are still alive and swiming as well as the rainbows, sword tails, barbs and ottos. So i checked the paramiters and everything was where it should be. The c02 was 42ppm. This measurement was taken two hours after lights out, three hours after co2 shuts off.

So, does anyone have any ideas what happend? They were beautiful fish...
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Old 02-01-2006, 07:08 AM   #2 (permalink)
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From your post I would assume some or all of the rummynoses died. Is that correct? Is it possible the co2ppm being cut in half had something to do with their demise. I know rummys are extra senstive to changes
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Old 02-01-2006, 07:11 AM   #3 (permalink)
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Yes, they all died, at least thats what it appeard.

Waht do you mean by co2 being cut in half? I did not do the water change after lights out, thats when i found everyone dead and tested the water.
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Old 02-01-2006, 08:36 AM   #4 (permalink)
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Perhaps it was the fluctuation of the pH. Remember that by the time most Tetras hit your tank, they are pretty stressed from transportation to the LFS, stressful conditions at the LFS (cramped quarters), stress from being netted, stress from transportation from the LFS to the new owner's tank. The fish Pete sells may have very well of been wild caught on top of all of that, so these guys have been through a lot stressful conditions along the way and major water change may have been the straw that broke the camel's back.

With hindsight being 20/20, it probably would have been better to drip acclimate the Tetras with the water they came in into a quarantine tank and then leave them be for a couple of weeks. I know that Pete also sells RO & tap water options for some fish, like the wild caught Hatchetfish. The Tetras may have come from an RO water tank. I know that I've killed whole batches of home grown Tetra fry by trying to acclimate them too quickly to peat filtered tap water and they were born and raised in RO water. I'm still trying to master RO to tap water acclimation for Tetras. While rapid pH fluctuation can stress most fish, I've been told that with Tetras it's the KH fluctuation can kill them. In nature, Tetras come from very pure water with a KH of 4 or less.

So stress and major fluctuation in water parameters may be the culprits here...
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Old 02-01-2006, 09:38 AM   #5 (permalink)
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My understanding is Pete had already aclimated them to harder water. His pH is 7.7 and his hardness is 300. I know he had the fish for a while, about three months, so one would think they would have been happy with the lower pH.
Pete said he would check the peramiters in his tanks ang get back to me. He mentioned doing two water changes a week of about 20-30%. We talked about the RO water and he said he did for a while, but then found out it isnt needed.
Then again, I could be wrong. I am not nearly as knowledgeable with these live things as i am my cars.

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Old 02-01-2006, 09:56 AM   #6 (permalink)
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What I meant by the co2 level was the whole kh/ph co2 relationship. What is your co2 level when you changed the water. If it's as high as you say they might not have been able to handle that much of a change when you did the 50% wc.
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Old 02-01-2006, 10:00 AM   #7 (permalink)
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Oh, i fallow now! Any idea how to lower the risk of this in the future/
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Old 02-01-2006, 11:53 AM   #8 (permalink)
 
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Put them in after a day or 2 after a waterchange to make sure your tank balances out (temp, co2 levels, o2 saturation).
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Old 02-01-2006, 11:56 AM   #9 (permalink)
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Any precautions i should take when doing a water change once they are in there? As i said this is all new.
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Old 02-01-2006, 01:18 PM   #10 (permalink)
 
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Pour or pump water slowly or use the sprinkle effect (simulates rain). Temp is a big part also.
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