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Old 02-22-2018, 05:12 PM   #1
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Death by water change

I've been having issues with fish deaths after doing 30%+ water changes. I typically do about a 10%-15%water change a week. On occasion I'll do a larger one when ammona creeps up. A few time when I've done this I've lost a fish or two (always my Florida flag fish). No notable water parameter changes and I let the water sit for days in 5 gal jugs to temp balance.

Tank is 125 gal planted about a year old
Stock
-1 5in bluegill
-12 flathead minnow
-1 gorami
- was 6 Florida flag fish now down to my last 1
-3 mystery snails
-1 brisle nose pleco

When this happens I observe no signs of stress from any other fish not even the surviving flag fish.
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Old 02-22-2018, 05:37 PM   #2
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Hello Aaron...

By routinely removing and replacing only 10 - 15 percent of the polluted tank water, you're maintaining a specific water chemistry. Your fish have become used to living in water with higher nitrogen. By suddenly changing out twice the old water, you've changed the chemistry suddenly. This is deadly to most aquarium fish. Your removing and replacing more tank water is a good idea, but you need to make these changes gradually.

Ideally, you should be changing out at least half the water every week to maintain healthy water conditions. But, this needs to be done over a long period of time. Each week, change out a little more water and then a little more and so one. Your fish won't notice a gradual change in the water chemistry. A sudden change obvious to you or not, is very stressful and deadly as you've noticed.

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Old 02-22-2018, 05:38 PM   #3
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Death by water change

Hello and welcome. I can't imagine how Ammonia can creep up in established tank, especially planted. Why do you believe this to be an issue behind the deaths? What is the idea behind letting the water sit in jugs for days? What filtration do you use?
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Old 02-22-2018, 05:40 PM   #4
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Maybe you should be doing 30% water changes all the time and not sometimes?

Maybe letting the water sit for days is causing a bad bacteria to form in your buckets?

I would get a hose for your faucet that has hot and cold in your home. Get a digital thermometer and set your temp as you fill the buckets from the hose on your sink, treat the water with dechlorinator and add the water to the tank immediately afterwards.
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Old 02-22-2018, 05:43 PM   #5
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Thanks for the imput
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Old 02-22-2018, 05:45 PM   #6
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Aaron, with a matured cycled tank, serviced with proper water maintenence and careful feeding, the ammonia should never creep up. That might be a good spot to start your investigation. Your Florida Flag fish might be suffering to the described chemistry fluctuations occurring in the water.
Might try 2x 20% - 25% WC's a week. It's a lot more work but it's likely to pay off.
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Old 02-22-2018, 05:48 PM   #7
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Thanks for the input and your probably right it was my first thought as well. Only issue is it dosent always happen and as noted theirs really no notable change to my parameters they stay pretty stable and its only the flag fish. Must just be their the weakest link. Just floating this out there in case theirs something else I was missing most everything in the tank is pretty hardy their likely just the canary in the coal mine.
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Old 02-22-2018, 05:52 PM   #8
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Heavy feeding periods when I'm off work longer streches
And it's got a hydor 250
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Old 02-22-2018, 06:06 PM   #9
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Quote:
Originally Posted by Aaron10020 View Post
Heavy feeding periods when I'm off work longer streches
And it's got a hydor 250
So your 125g tank only has a 40-75g filter?
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Old 02-22-2018, 11:20 PM   #10
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It's either a peramiter shift from the unusual wc volume or some trace elements I'm my tap that I don't know to look for.

As far as the storage of the water it's in food grade storage containers and nothing but dechlorinater and tap water have ever touched them. I use them for the smaller water changes and have had no issues.
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