Help.. Sick Cardinal Tetras

Fishyfishlondon

Member
Hi!

I’ve recently set up my first new fish tank. It’s been up for a few weeks and had 4 gold cardinal tetras and 4 zebra danios as the first fish.

Within a day or two 2 of the tetras died without showing signs of illness. The other 2 have remained looking good but now won’t eat. One of the tetras also has damaged fins and it’s insides seem to be going black and I’m not sure why or how to fix?

Are they diseased? The water tested fine and they were acclimatised for around an hour.

I’ve heard that zebra danios aren’t good with the tetras so could it be stress?

Thanks for your help!
 

Adriifu

Member
What are all of your water parameters?
What's the tank size?
Have you witnessed any aggression between the two species?
What's the temperature of your water?
Have you applied any medications to the water?
 

KimberlyG

Member
Wow, I am not familiar with gold cardinal tetras, but I have never seen anything like this before.
 
  • Thread Starter

Fishyfishlondon

Member
Yes they do sometimes nip and chase the tetras.

The nitrite is 1ppm and the nitrate is 20ppm. I don’t know about ammonia.It’s a 125l with fluval u3 filter. I use prime as water conditioner and dosed with stress coat today.

Thanks

Water is 25 degrees and I haven’t applied any medication (only stress coat)
 

Adriifu

Member
This looks like a mixture of ammonia burns and fin rot. I would do a 50% water change to get nitrites and ammonia down as well as an addition of Fungus Cure for the fin rot. The medication will lower oxygenation, so try adding an air stone to prevent this. You also need to move the zebra danios to a separate tank or return them if possible, as they may be causing the fin rot.
 
  • Thread Starter

Fishyfishlondon

Member
Thanks Adriifu, will try tomorrow and let you know how it gets
 

Adriifu

Member
Fishyfishlondon said:
Thanks Adriifu, will try tomorrow and let you know how it gets
No problem, love. Tomorrow may be too long for your tetra, so you may want to start very soon. Anyway, good luck!
 

Brittni808

Member
lots of water changes!! firm believer in that no chemical is better for fish than clean water (until your issue resolves)
 

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