Black on the fin of neon tetras?

Navfish

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i set up my 37g and put my tetras in 2 days later transferring my old bacteria and put beneficial bacteria. But they seem to have a bit of black and red on their fins (way more black only little red).

Temp: 76
Water parameters:
Ammonia: 0
Nitrite: 0
Nitrate: 10

I don’t know what seems to be up. Looked it up online and saw people experiencing the same thing but no clear answer to issue

It’s not ammonia burns so what could it be, stress from moving yesterday to the tank?
 

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Sgooosh

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they look really healthy to me. maybe because they like the tank, their colors are improving
1663813899224.png

based on what i know, it is normal for them to have black on their fins as they grow up in some batches
i set up my 37g and put my tetras in 2 days later transferring my old bacteria and put beneficial bacteria. But they seem to have a bit of black and red on their fins (way more black only little red).

Temp: 76
Water parameters:
Ammonia: 0
Nitrite: 0
Nitrate: 10

I don’t know what seems to be up. Looked it up online and saw people experiencing the same thing but no clear answer to issue

It’s not ammonia burns so what could it be, stress from moving yesterday to the tank?
 

Colin_T

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Depending on what time you took the pictures. If you took them in the morning straight after the lights came on, it could be nocturnal or stress colouration. Or super happy colour, but black on fish (that isn't ammonia or chemical burns) is usually nocturnal colour.

If the fish are eating well and the water is good, monitor and see how they go.
 
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Navfish

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they look really healthy to me. maybe because they like the tank, their colors are improvingView attachment 167329
based on what i know, it is normal for them to have black on their fins as they grow up in some batches
Depending on what time you took the pictures. If you took them in the morning straight after the lights came on, it could be nocturnal or stress colouration. Or super happy colour, but black on fish (that isn't ammonia or chemical burns) is usually nocturnal colour.

If the fish are eating well and the water is good, monitor and see how they go.
It’s gotten worse I think. I’m worried. They tail is turning orange from in to out.

Black fins and orange tail is not a good sign i think.
They are all looking like this.
They are acting normally thou and eating/pooping normally as well.

Also having a black streak at the bottom of red area of their body

And as I said before they are new to this tank (2 days ago I put them in)
 

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connorlindeman

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It’s gotten worse I think. I’m worried. They tail is turning orange from in to out.

Black fins and orange tail is not a good sign i think.
They are all looking like this.
They are acting normally thou and eating/pooping normally as well.

Also having a black streak at the bottom of red area of their body

And as I said before they are new to this tank (2 days ago I put them in)
They look fine to me...
 

Naughts

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They are thin. Feed them up and provide floating plants so they are comfortable getting food at the surface. Monitor for signs of parasitic worms.
 
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Navfish

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They are thin. Feed them up and provide floating plants so they are comfortable getting food at the surface. Monitor for signs of parasitic worms
I had no clue they were thin! I don't feed them at the surface but put the food in the water so it slowly falls and don't need to come to the surface!
 

Colin_T

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The pictures are blurry so can't tell much, but one fish did look like it was covered in a creamy white film, which is excess mucous caused by something in the water irritating the fish.
 

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