Important [nsfw] Anyone Had Neon Dwarf Rainbowfish Die Off Suddenly?

noobscaper

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About 4 months ago, I got some neon dwarf rainbows for my 240 litre (~63 gallon) aquarium, and they all seemed fine for the first 3 months. Fast forward to May, 2 of them died within two days, and today, around a month later, another one has dropped dead. There seem to be no visible signs of any disease on it. Can anyone help?

Here’s a picture. Looking back, his spine seems to be bent down and to the left. Is it possible that as a male fighting for dominance, he got injured?
 

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CraiginWales

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bobbyta74 said:
About 4 months ago, I got some neon dwarf rainbows for my 240 litre (~63 gallon) aquarium, and they all seemed fine for the first 3 months. Fast forward to May, 2 of them died within two days, and today, around a month later, another one has dropped dead. There seem to be no visible signs of any disease on it. Can anyone help?

Here’s a picture. Looking back, his spine seems to be bent down and to the left. Is it possible that as a male fighting for dominance, he got injured?
How many did you have? Water parameters? Temperature?
 

Adam Pacio

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Was the tail fin split when it was living? Split fins can be the sign of distress or fighting. What else is in the tank?
 

Adam Pacio

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Sorry for late reply. I've been told while considering Dwarf Neon Praecox myself for my own tank that this particular sub-breed is prone to sudden die-off due to lazy breeding. The Dwarf Praecox are popular so inferior strains have developed and been too interbred making what you encountered a rather common occurrence.
 
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noobscaper

noobscaper

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Adam Pacio said:
Sorry for late reply. I've been told while considering Dwarf Neon Praecox myself for my own tank that this particular sub-breed is prone to sudden die-off due to lazy breeding. The Dwarf Praecox are popular so inferior strains have developed and been too interbred making what you encountered a rather common occurrence.
OK. I’ll up the school to 6, then add more rasboras
 

CraiginWales

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bobbyta74 said:
OK. I’ll up the school to 6, then add more rasboras
The superior ones really do pop out at you. If they have a fantastic show of neon blue then they’re generally well bred, even when they’re only an inch long. The inferior ones are quite drab in comparison.
 
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noobscaper

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CraiginWales said:
The superior ones really do pop out at you. If they have a fantastic show of neon blue then they’re generally well bred, even when they’re only an inch long. The inferior ones are quite drab in comparison.
I'm afraid my local big-box stores don't have anything that's really good - not even plants
 

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