goldfish disease: Cotton-like

[djbobo]

goldfish disease:Cotton-like with picture

Hi,
Can anyone help me about this disease?
first cotton-like appear on ray then disappear and make a hole on ray.
I have 4 goldfish in 40lit aquarium, without plants, and water temp is 25-30C.

 

[Holly9937]

I would have guessed cotton disease/fungus, but I've never heard of it turning into a bloody hole... How often do you do water changes? You're a bit overstocked and goldfish produce quite a bit of waste, at the very least do a large water change. Also, what is your amonia and nitrite? and how long have you had these fish?

 

[djbobo]

I changed whole water every month or 45 days, and I have these fishs from 2 years ago. amount of amonia and nitrite is unknown (I haven't any device or kit to measure it).

 

[TipStylez]

Wate...the only time you do a water change is a 100% ever month-45 days? Or you do some 20-50% water changes a few weeks in between them 45 days?

 

[zazz]

4 goldfish in a 40 litre aquarium, and you change all the water once every month or so?
and 25 to 30C...
what sort of goldfish are these?
I am sorry that I do not recognize the specific ailment in the picture.
can we see a picture of all the fish?
i am just interested to see. and you took a very good picture of that ailing fin.
tried melafix?

 

[djbobo]

the only time you do a water change is a 100% ever month-45 days? Or you do some 20-50% water changes a few weeks in between them 45 days?

sometimes add 10-15% in summer, but no water change.

can we see a picture of all the fish?

yes, here is may tank:

tried melafix?

No, in my region this kind of product unavailable.

 

[TipStylez]

maby your lack of water change and gravle vac is the cause of growing bacteria under your gravel. Your suppose to change atlease 20% water w/ gravel vac evey 1-3weeks but 3 weeks the least. I know your water looks clean and all but once you start doing a gravel vac youl see all the trash.

 

[zazz]

Thank you for the pictures . They are certainly beautiful fish. They are very small for 2 years.
Melafix contains melaleuca oil.
Maybe you can find that.
or, order melafix over the internet?
You can also try applying an antibiotic to the spot I suppose.
The fish have been crowded in that tank for two years. Maybe they will not live much longer. Maybe they will now begin to get one disease and another disease.
I do not know.
I do not know how long you can keep goldfish alive in the way you discribe.