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@danb
Fungus isn't fixable generally - the fungus actually eats the coating of the lens element.
You can try disassembling it to remove it and hope it hasn't damaged the coating too badly
As to whether it will impact the usage - it depends on which elements have suffered (generally speaking the elements closer to the rear of the lens will have more of an obvious effect on image quality)
Given that its only a 1.8, its probably simplest to pick up a fungus free replacement