Sudden tetra aggression? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 06-01-2019, 03:47 PM Thread Starter
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Question Sudden tetra aggression?

Hi everyone, I'm new to the forum.



I have recently had a strange occurrence in my 29 gallon planted tetra tank.



In the tank, I have 8 neons, 6 serpae, and 6 black skirt tetras (plus some otocinclus and a pleco). All fish have been in perfect health. A couple of days ago I did a 30% water change and added a small dose of flourish excel. I left for a few hours, and when I returned all the neon tetras had badly damaged tail fins, some were almost completely gone. The serpae tetras had less extreme, but new rips in their dorsal fins, and a few of the black skirts had small pieces of their anal fins missing.


I'm thinking one or more of the black skirt tetras became suddenly very aggressive for some reason? I have seen no signs of aggression from any of the fish, however. All of the fish are still eating well, and actively swimming as usual. No further fin damage has occurred since as far as I can tell.


Can anyone help me understand what happened?
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post #2 of 6 (permalink) Old 06-03-2019, 07:15 AM
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Serpae tetras are pretty nippy but you haven't seen them displaying aggressive behavior?


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post #3 of 6 (permalink) Old 06-03-2019, 04:18 PM
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Serpae tetras are known for being aggressive. Mine quit nipping as much once I got their numbers up to ten- plus then they won't bother other fish as much, being concerned with themselves. Even then there will be some fin-nipping within the group until they sort out their hierarchy.


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post #4 of 6 (permalink) Old 06-04-2019, 12:00 AM Thread Starter
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Originally Posted by JJ09 View Post
Serpae tetras are known for being aggressive. Mine quit nipping as much once I got their numbers up to ten- plus then they won't bother other fish as much, being concerned with themselves. Even then there will be some fin-nipping within the group until they sort out their hierarchy.

I have noticed the Serpaes chase each other fairly often, but it never seems to result in fin damage. The Serpaes never go after the neons; or at least I have never seen them do it.



The neons are all healing up nicely now. However, I'm concerned that the next water change will trigger aggression. I guess I will just have to watch more closely next time and see what happens.
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post #5 of 6 (permalink) Old 06-04-2019, 01:59 AM
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Probably got excited with the water change and there was a rumble in the bronx. Sometimes water changes will bring out the best/worst in fish/shrimp.
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post #6 of 6 (permalink) Old 06-04-2019, 04:26 AM
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Water changes often bring on breeding behavior as well. Which can get a bit violent in tetras. As long as your water conditions are good nipped fins usually just heal up just fine.


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