Aggressive glow light tetra

Jamie1066
  • #1
I recently started a shoal of glow light tetras with four. One has started chasing the others Would adding more help? Should I remove him (I have another community tank he could go into)? Then I would need to add more to keep him company and hope that he doesn’t resume his aggression. Thx for suggestions!
 
RyanC14
  • #2
How big is the tank? Has the tetra caused any actual damage to the others?
 
Vinh
  • #3
Glow tetra red,yellow,blue,gray are peaceful fish..only glow tetra barb are midium agressive..
 
Jamie1066
  • Thread Starter
  • #4
How big is the tank? Has the tetra caused any actual damage to the others?
10 gallon. I don’t think he has actually damaged the others except emotionally! They are not shoaling as well as they did at first: he keeps breaking up the shoal.
 
StarGirl
  • #5
Can you add a picture to be sure they are really Glowlight tetras? And how many other fish are with them?
 
FinalFins
  • #6
I think the Op means to trademarked GloFish.
 
chromedome52
  • #7
It could be a male wanting to get busy. Might be able to sex them from photos. As long as there's no physical damage, I wouldn't worry about it.

I am hoping he does have Glow Light Tetras, Hemigrammus erythrozonus, as Glofish Tetras get too big for a 10. Without a photo, we can't say what he has.
 
Fljoe
  • #8
I recently started a shoal of glow light tetras with four. One has started chasing the others Would adding more help? Should I remove him (I have another community tank he could go into)? Then I would need to add more to keep him company and hope that he doesn’t resume his aggression. Thx for suggestions!
I’m having the same issue. I originally had 4 Glowlight Tetra. They always swam together and I enjoyed watching them. I felt bad that the group was so small. I added 5 more yesterday. Now they are showing aggression towards 2 of the new guys. And they aren’t swimming together like the original 4 did. Now they act like my group of 7 Black Neon Tetra. They just hover in place. I’m going to give it a few more days and see what happens. The aggression isn’t causing physical harm, maybe some stress. Hopefully yours and mine figure it out on there own.
 
Jamie1066
  • Thread Starter
  • #9
Can you add a picture to be sure they are really Glowlight tetras? And how many other fish are with them?
There are two bleeding heart tetras with them. Pic of the fish in question:
653DD7D1-E1CE-4594-AFAC-11C2511EF7D5.jpeg
 
Fljoe
  • #10
There are two bleeding heart tetras with them. Pic of the fish in question:View attachment 630693
Unless it’s just the lighting, it looks a little pale. It could be stressed.
AD7B1621-8391-4CB8-BFE1-A5EB3A67581F.jpeg
6A2A5F93-00CA-4F54-9DD9-1B6B9A84ECA8.jpeg
 
Fljoe
  • #11
I think the Op means to trademarked GloFish.
No! The OP knows it’s the Glowlight Tetra!
 
Jamie1066
  • Thread Starter
  • #12
Jamie1066
  • Thread Starter
  • #13
It could be a male wanting to get busy. Might be able to sex them from photos. As long as there's no physical damage, I wouldn't worry about it.

I am hoping he does have Glow Light Tetras, Hemigrammus erythrozonus, as Glofish Tetras get too big for a 10. Without a photo, we can't say what he has.
No, they’re definitely not Glofish.
 

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Fljoe
  • #14
these pics may be better. They are not super colorful but I am sure they are being stressed out by the bully in their midst.View attachment 630702View attachment 630703View attachment 630704
Yes they do look better in those pictures.
Although from what I remember reading about them, they do like a darker background and substrate. I don’t know if that would effect the behavior. I’m fairly new to this. So I am still learning myself.
 
Jamie1066
  • Thread Starter
  • #15
Yes they do look better in those pictures.
Although from what I remember reading about them, they do like a darker background and substrate. I don’t know if that would effect the behavior. I’m fairly new to this. So I am still learning myself.
Darker environment? Interesting! I’ve never heard that. I can certainly darken the substrate. I’ll look into lower wattage lighting, too. I want them to be comfortable. Thanks!
 
Fljoe
  • #16
Darker environment? Interesting! I’ve never heard that. I can certainly darken the substrate. I’ll look into lower wattage lighting, too. I want them to be comfortable. Thanks!
I could be remembering wrong. I’ve been researching a lot of fish. If you google them, it will pull up lots of good information on what makes them happy and comfortable.
 
RyanC14
  • #17
Adding a few more hides or plants could help lessen stress
 
Fljoe
  • #18
Darker environment? Interesting! I’ve never heard that. I can certainly darken the substrate. I’ll look into lower wattage lighting, too. I want them to be comfortable. Thanks!
I do have a black background, but my substrate is tan gravel. Read this.
8EA138C4-EEFE-408B-BA64-336CC8B87147.jpeg
 
Jamie1066
  • Thread Starter
  • #19
I do have a black background, but my substrate is tan gravel. Read this.View attachment 630714
Great info. But it sounds like glowlights may not be a great choice for building a community tank: unless it’s a community of dimness-loving species. The water here isn’t great. The temp is 78. I’ll jump right on adding more plants and tannins. And finding compatible tank mates. Thanks!
 
Fljoe
  • #20
Great info. But it sounds like glowlights may not be a great choice for building a community tank: unless it’s a community of dimness-loving species. The water here isn’t great. The temp is 78. I’ll jump right on adding more plants and tannins. And finding compatible tank mates. Thanks!
They are adaptable. I am in Florida with hard water and the tank runs 80-81 degrees.
 
chromedome52
  • #21
Just to note, they all appear to be males. It is possible that the angry fish is establishing dominance over the group, in which case things will usually settle down after a week or so.
 

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