Help, Fish May be Sick?

[Adam S]

Hi Everyone,

So I noticed a few things and not sure what it means:
My albino catfish is turning dark brown along a lot of its body.
My goldfish look like they have white marks on them.
My koi looks like it may have blue or strange marks on it.

Please help, does anyone know what may be going on and what I can do?
The fish all seem to be behaving normally, thank in advance!

Adam

 

[Meyer Jordan]

Post photos, if possible, please.

 

[Smaug]

Yes photos along with all water parameters (actual numbers) and size of pond.