QUOTE="Rich17, post: 238962, member: 6640"]Size of pond is around 6 foot by 5 foot and 3.5 foot deep[/QUOTE]
Could you please tell us what test kits you use , if its a stick kit get rid of it as they are rather inaccurate in their readings buy an API test kit instead next your water perameters Ammonia, Nitrite, Nitrate, Ph, Kh what are their readings please?
Next please tell us a little more about your pond its maintenance and water changes , by maintenance we mean filters and also pond , this can be a cause of fungus on koi , when was the last time you cleaned the bottom of your pond ?
Yes Malachite is for treating fungus but if your going to stop in re occuring the above becomes neccessary however looking at the state of the bottle I'd say that it may well have passed its useful date (how long have you acctually had this bottle ] if a year and opened replace it if unopened keep (for future reference).
One thing I find rather worrying is you dont know the exact size of your pond , you need the exact measurments to get any treatments right, for instance our own pond is 1,000 imperial gallons so this would equate for the three main treatments formalin 75 ml , Malachite 60 ml Acriflavine 120ml.
so you'll need to work out the right amount of treatments yourself .
Where are you from at 3.5 ft your pond is the wrong depth for koi especially if you get bad winters where you are , a minimum of 4.5 ft maximum of 5ft being the correct depths for keeping koi .
I'm hoping you say the UK Rich and not the US
Upon looking at this photo and the others however I'd say this may well not be fungus but instead koi pox which may explain why there is no change after you treating your koi.
Can you tell me exactly what they look and feel like under your fingers, is it like a hard white waxy growth which is how many koi keepers describe it as ?
If its fungal it will feel different softer perhaps and more mobile/ mannuable under your touch
Now if it is carp pox then you have nothing to worry about, however with this cold snap here in the UK I can well believe it would appear early , Normally it will disapear as the temperature of your pond rises re appear as it goes down and it will normally last for between 2-4 years before it disapears completely.
Its a harmess virus also know as fish pox
On duitsu koi it normally apprears on areas of no scales which is what we are seeing here but we'll need your description of them to know for sure.
Dave