This question is on behalf of my sister who has tropical fish. She has a 4ft well established tank with relatively few fish in it (approx 10 tetra size fish) but on adding a couple of new fish they seem, in turn, to be developing a hunchbacked or `kinked` body. I`ve looked on the internet but it`s just made me more confused with all the scientific talk. Any ideas as to the cause that can be easily explained?

I had a tetra who was like that, he was like that when I got him but when the guy noticed he gave me 2 extra fish free. It died. I have no idea what was wrong with it though, and the rest were ok.
Not much help, sorry!

x

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Milo and Maisy

one or two of my 4 year old danio`s are like it,i wouldnt worrymaybe its a sign of maturity???

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its a spine defect. ive seen it many times in the trade, usually in small tetras and danios, but occasionally livebearers as well. my theory is that in todays age, where aquarium fish are bred en-mass to cope with the global demand, the runts and deformed young that are usually killed off, are sometimes missed, and find their way into the trade.

Why would the fish that were previously ok start to bend though once a bent one was added to the tank? It seems to be something that`s spreading.