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I have a 15 gallon tank stocked with various tetras & danios. 12 in total. I tried searching for arched backbone in the diseases section but nothing comes up. Have tried googling with no luck.

Temp: 78
PH: 7.2
Ammonia: 0
Nitrite:0
Nitrates: unknown

I have one danio and one rummynose tetra that have arched backs. This has happened over about the last two weeks or a month as I had been away for 2 weeks prior to first noticing. All other fish are fine. Incidentally these happen to be the 2 smallest fish in the tank.
They are not eating, and yet are swimming fine. The danio's tail is almost gone, but all other fins on both are fine.

I have not added any new fish to this tank in about 2 years, and have not had anything wrong or die in about 4 years.
I should mention the while I was away on holidays the airpump had stopped working and my friend was unsure how long it had been out before I came home. I am wondering if that had something to do with it.

Anyone have any ideas what causes this??

The problem you are refering to can be caused by too much inbreeding, and a very poor diet of their parents and or when they were fry. I remember reading about this it was concerning the vitamins and the minerals in their diet.

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Betta 11Gal Desktop & Placidity 5ft Community Tank Photos


Keith

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Thank you for your response. I guess that could be it, just sort of shocking for it to happen all of the sudden. Although I suppose it could have happened gradually until it became incrediably noticeable.

Try taking a look at this and see if it helps:

Fish Tuberculosis

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I'm not your neighbor, you Bakersfield trash.

I think cory addict has mentioned something worthwhile there, fish tb can strike very quickly, its worth checking into.