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Old 02-04-2018, 06:36 AM   #1
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Fish dying for no reason?

Originally = 10 neons and 4 male guppies
Tank setup = 6 months
Testing (today) ammonia 0.25 ppm, nitrite 0 ppm, nitrate 5.0ppm

Problem = one guppie and one neon died within a month for no reason that I know, totally fine and feeding the same day.
The guppy died first I found him dead in the filter the next morning and he was totally fine at lights out the night before!
Neon terra= died yesterday, when I got him out, I did a 50% water change. I tested the water the next day(today) and the results are above ^. The neon was totally fine on the morning, it ate and was schooling with the rest, found it dead on the afternoon with no marks, bloating or signs of why it died.

Can anyone help?
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Old 02-04-2018, 09:50 AM   #2
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Neons are notorious for being overly sensitive towards parameters. If you did a 50% change then got that reading with .25ppm ammonia it means the ammonia was probably around .5ppm because you changed half the water which took out half of it. However with only 1 dying it seems like either he wasn't a strong one or, he had columnaris. Columnaris is a silent killer, fish don't show symptoms then bam they either straight up die or show wild symptoms then die in 20~ hours, I would look into online, I had it in an angel fish and he was fine then one day he became paralyzed but was still breathing and died within 2 hours
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Old 02-04-2018, 10:19 AM   #3
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Fish dying for no reason?

I bought 6 Neons over a year ago to add to an existing school. I didnít quarantine. They all died and took about half of my tank with them. Betta, kuhliís too. All without visible symptoms the day prior. Suspect it was the dreaded big C.
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Old 02-04-2018, 10:39 AM   #4
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Quote:
Originally Posted by TMaier View Post
I bought 6 Neons over a year ago to add to an existing school...Suspect it was the dreaded big C.
Were these purchased from an LFS or big box store?
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Old 02-04-2018, 11:19 AM   #5
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I think it was big box. But that was where most of my fish have come from. When I took the bodies back for a refund they told me they had lost the whole tank. Definitely a bad batch. I recently purchased 20 Neons for a tank that had no other fish at that point. Same store. Iíve had them in there for a month and no fatalities yet.
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Old 02-04-2018, 12:28 PM   #6
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Oh really! I did a quarter water change today after testing, will test again tomorrow. It just seems strange to have them 6 months and just lose them like that
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Old 02-04-2018, 01:35 PM   #7
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One of the more frustrating aspects of the hobby. Would totally think 6 months was in the safe zone. But I guess some illnesses can be present all the time but if something stresses the fish they can take advantage of the issue and thrive.
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Old 02-04-2018, 02:03 PM   #8
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They were strong from the beginning, I put the neons in 4 days after set up because the pet store said it would be fine (I didnít know about the nitrogen cycle) one got into the filter a few months later and after a night in the net and ripped fins, it survived and the fins repaired so I couldnít tell which one it was. So one just dies after all this time is sad ☹️
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Old 02-04-2018, 02:24 PM   #9
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I agree with Ihaveaquariums, and 2. if your not doing water changes regularly alone with vacuuming,cleanings as needed the ammonia will climb and kill. The weakest go first. Over feeding plays a part too.
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Old 02-04-2018, 08:42 PM   #10
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I ran across this the other day. Neon Tetra Disease, incurable and silent.
https://www.aquascapeaddiction.com/a...-tetra-disease
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Old 02-05-2018, 05:06 AM   #11
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I donít think that it is neon tetra disease because the one that died showed any symptoms of that disease!
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Old 02-05-2018, 06:27 AM   #12
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Sometimes fish actually die of old age .Having it only 6 months does not mean it is not older , especially if they were not tiny when you got them..
I am not certain on neons but in the wild Cardinals are considered 'annuals' living only a year?
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Old 02-05-2018, 06:43 AM   #13
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I was thinking that, i think I read on the internet 10 years but not sure! When I got the 10 neons I think 2 were at full size, I canít tell now who is who because they are all at full size, apart from one because he has one stumpy fin that has been the same since I got them, heís called nemo of course
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Old 02-05-2018, 06:44 AM   #14
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Just looked 10 years normally, 5 in an aquarium
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