Guppies dying in a well established tank - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 14 Old 07-21-2015, 06:53 AM Thread Starter
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Guppies dying in a well established tank

Hi,

I'm new to this site but I hope you can help me. I have a well established (8 years) Guppy tank (100l / 25 Gallon) which is heavily planted. All the Guppies were born in the tank and I have many generations. As you know perfectly well, Guppies like to breed so the tank is well populated, however I do regular water changes and water tests and this keeps the readings perfectly. I think the plants help as well and they are thriving.
In addition to the numerous Guppies I have one red tailed black shark and a Panda cory.

On Friday I decided to buy one further male guppy in order to try and introduce a different colour and vary the gene pool. Last night I came home from work to find 4 dead adult Guppies and the other adults swimming at the top of the tank. After a few minutes of watching I saw three further fatalities. There is no signs of fungal growth at all. The Guppies look very lethargic and eventually can't hold there place in the water, sink to the bottom and die. The baby fry (numerous) don't seem to be affected at the moment, neither are the RTB shark or Cory. At feeding time, there isn't the normal feeding frenzy that I've become accustomed to.

Last night and did a 30% water change and added carbon foams to my filter. This morning there were no further deaths but the adults are still swimming at the very top and not really interested in food. Incidentally, the new addition doesn't seem to have any problems as yet.

Water Params:
Ammonia = 0
Nitrite = 0
Nitrate = 20
Temp = 78F

I will do another large water change tonight and keep my fingers crossed, but its so upsetting to lose so many already, when for eight years I haven't lost any apart through old age.

Any comments or suggestions welcomed

Steve
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post #2 of 14 Old 07-21-2015, 09:11 AM
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Guppies dying in a well established tank

:( You should always quaratine....

Hopefully someone with a better idea of diseases will come along to answer your questions.

Sorry about your loss
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post #3 of 14 Old 07-21-2015, 09:19 AM Thread Starter
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:( You should always quaratine....

Hopefully someone with a better idea of diseases will come along to answer your questions.

Sorry about your loss
Thanks for your reply. I guess you learn by your mistakes. I'd been looking at the guppies in the LFS for a few weeks but I suppose that's no guaranty that they hadn't re-stocked in between times.
I'm not sure I'd have spotted anything even if I had quarantined because of all the adult guppies, he's the only one looking healthy now.
It staggers me how quickly the adults have been affected, yet the young are normal ....... so far.
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post #4 of 14 Old 07-21-2015, 09:26 AM
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Is the male you bought still alive?
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post #5 of 14 Old 07-21-2015, 09:39 AM Thread Starter
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Is the male you bought still alive?
Yes, he's looking fine at the moment. Very strange!!!
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post #6 of 14 Old 07-21-2015, 09:45 AM
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it's probably something he's immune to... Since your guppy colony has been isolated for 8 years they may be susceptible to new strains of diseases that your new males may have brought in... Just speculation :P
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post #7 of 14 Old 07-21-2015, 09:49 AM Thread Starter
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it's probably something he's immune to... Since your guppy colony has been isolated for 8 years they may be susceptible to new strains of diseases that your new males may have brought in... Just speculation :P
This is kind of what I was thinking, but if that's so, how does quarantining help? I guess I should have quarantined but added a sacrificial guppy with him to see if there was an issue?
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post #8 of 14 Old 07-21-2015, 10:37 AM
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I guess that would have to be the case then... I have no idea what the issue might be at all...Keep us updated!
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post #9 of 14 Old 07-22-2015, 02:21 AM Thread Starter
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I guess that would have to be the case then... I have no idea what the issue might be at all...Keep us updated!
Well it's good news a and bad news.
Bad news is that I lost another 12 adult guppies and a few fry.
I removed the carbon pads and dosed the tank with eSha 2000.
Good news is that this morning the remaining fish seem to have picked up and generally look healthier than last night. They are swimming around a little better and ate their flake. I'll finish the three day course then do another water change and replace the carbon filters. Fingers crossed we're through the worst.
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post #10 of 14 Old 08-03-2015, 07:35 AM Thread Starter
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Update News,

After dosing the tank with eSha 2000 for the recommended 3 days the tank life (what was left) was pretty much back to normal with no further deaths. A week later and all the tail fins of the survivors have repaired and it's as if nothing happened, except for the 'culling'.
After speaking to a few enthusiasts and reading a forum or two, I think the conclusion is that because all my guppies are effectively offspring of my original three females and two males from 8 years ago, they have been inbreeding for generations and have become genetically week. that and because the tank has effective been a closed system as far outside additions are concerned, has meant that even the slightest infection had a devastating effect. Similar the Martians dying due to our common cold (War of the Worlds).
Lessons learnt - From now on I may, add the odd guppy every couple of months, one to increase the gene pool and also to test out the immunity of the existing housemates.

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