Help me figure out what's wrong with my goldfish please!!!

Question

Ok, so I have 2 fancy tail goldfish. They are about 6 months old. In just the past 2 days one had a little bit of black on the outline of his tail and top fin. Now it's almost taken over his whole tail, the sides of his face, patches on his body and now has a black line across his upper lip! The other one has started to get black on his tail also and it's spreading pretty fast. I thought it was tail rot but neither of their tails or fins have have any chunks or pieces missing. I went to the pet store tonight and asked and they said they had never heard of them getting black stuff all over them. Can someone please give me a clue as to what this may be?? Thanks!

Answer 1

Similar thing happened to my goldfish but instead of the black outlining, it was white. It must have been some sort of disease.

It died a couple of weeks later.

Answer 2

I agreee with ^ it might be fin rot. You could look at the pet shop and see if theres a treatment but otherwise theres nothing you can do..

Answer 3

i think it iz fin rott

saw it on tee vee

tak at  too da vet

Answer 4

might be a form of fin rot

Answer 5

fin rot i agree with the two girls

Answer 6

im not completely sure but when fish have been in bad water conditions they get amonia burns, these are invisible, when the burns heal they turn black, your fish might have been burnt and is now healing under your care.  Did you notice them darting around the tank looking irritated when you got them? this could be why. If there are no other symptoms there should be no other reason to worry.

Could also be his colouring, i also have 2 fantails around that age and one is turning very black, when they are very young they are mostly born gold and black, the colourings fade and change and part of the process they may get blacker or golder. Mine is getting blacker at the moment maybe your is too? your goldfish is very young so this could be the reason.

good luck hope it's ok =]