Black Skirt Tetra Aggression
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Black Skirt Tetra Aggression

This is a discussion on Black Skirt Tetra Aggression within the Characins forums, part of the Freshwater and Tropical Fish category; --> I have a 5 gallon tank with 2 long-fin black skirt tetras. I have had one (the larger one) for 2 and a half ...

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Black Skirt Tetra Aggression
Old 01-17-2008, 01:13 PM   #1
 
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Black Skirt Tetra Aggression

I have a 5 gallon tank with 2 long-fin black skirt tetras. I have had one (the larger one) for 2 and a half months, and the smaller one for 1 month. I do a 15-20% water change every 4 days. I did a water change yesterday. This morning I noticed my larger tetra kept chasing around the smaller one. Now, usually they do this from time to time. They chase each other around. But the larger tetra was being unusually aggressive towards the other. The smaller tetra was staying in solitary places - behind a rock decoration and near the upper half of the tank. In one case he just rested at the bottom of the tank, not swimming and body touching the gravel, as if he was exhausted from being chased.

I have to take them out of the tank each time I do a water change. When I released them yesterday, I put them in both at the same time. I have noticed a difference if I put the smaller one in first, then he seems to be more dominant over the larger one. What could be the cause of this unusual aggression?
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Old 01-17-2008, 01:20 PM   #2
 
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As small tank and too few of them. The aggression is beause they don't have a true pecking order. One goes in first, thinks it runs the tank and fights with the other as there are no others to spread out the aggression or the games they will play.

I am curious though, why do you take them out to do a water change?
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Old 01-17-2008, 01:20 PM   #3
 
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hi
personally i would say that it's because there is only the
two of them,they are far better off ina large group
then they spread the agression amongst themselves.
i think that soon enough you will find the smaller one dead,
if it is being chased to the extent that it is sitting on the
bottom of the tank,stress will kill it off soon.
if it were me i would take them back and get something else,
small shrimp and mystery snails perhaps ?
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Old 01-17-2008, 01:28 PM   #4
 
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Quote:
Originally Posted by fish_4_all
As small tank and too few of them. The aggression is beause they don't have a true pecking order. One goes in first, thinks it runs the tank and fights with the other as there are no others to spread out the aggression or the games they will play.

I am curious though, why do you take them out to do a water change?
I've noticed one is more dominant when I release them one at a time but yesterday I put them in both at the same time. I have been taking them out when I do water changes because I use a self-starting gravel vacuum that you shake up and down in the water to start flowing. Since the tank is so small I thought that would be very stressful on the fish if they were in there while I was doing that.

Quote:
Originally Posted by willow
hi
personally i would say that it's because there is only the
two of them,they are far better off ina large group
then they spread the agression amongst themselves.
i think that soon enough you will find the smaller one dead,
if it is being chased to the extent that it is sitting on the
bottom of the tank,stress will kill it off soon.
if it were me i would take them back and get something else,
small shrimp and mystery snails perhaps ?
Yes, they should be in a bigger group. Unfortunately I did no research on the fish beforehand. I figured I would get another one because it would be better to have 2 than 1. The smaller one has been able to fend for himself up to this point, I don't know why there is suddenly a problem. The good news is I am going to be able to set up a big tank within the next month, hopefully 55 gallon, in which I will be able to transfer these fish and get a few more (maybe 3?) to finish out the school.
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Old 01-17-2008, 01:32 PM   #5
 
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hi
if you can have them in a bigger group you will get to see them
at their best,they interact much better.
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Old 01-17-2008, 04:05 PM   #6
 
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Well I came home and the smaller fish is doing a lot better. He's holding up his own. It's interesting how they sometimes divide the tank up into their "territories". If the larger fish comes into his zone, he chases him away. I am looking forward to setting up the large tank and putting them there so that they will have much more room and can live in a proper school.
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Old 01-17-2008, 07:22 PM   #7
 
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Hi Jasey,
I have 5 black skirts in my 55 and they do definitely have their own territories. If ones invades the other's territory there is usually a very short chase. They also will school together at times. I'm glad you decided to get a bigger tank for them. They are a very hardy fish and get along fine with my other fish.
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Old 01-18-2008, 02:01 AM   #8
 
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hi
i'm glad he is holding is own,and hopefully he will
be ok.
Look forward toseeing your bigger tank. :)
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Old 01-23-2008, 11:19 PM   #9
 
you could also add some more plants to break up the line of site within the tank.
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Old 06-17-2008, 08:45 AM   #10
 
The Black Tetra is a peaceful, schooling species that should be kept in groups of at least three. Adults tend to be fin-nippers, so avoid tankmates with long, flowing fins.
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