is it infested?

hi guy
to be honest i have never encounter this on my brews , but recently after a long time not dry hoping i have encounter fungus or some kind of white stuff on the top of it , i don't know what it is or how to stop it can you guy help me ty in advance

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Hard to tell from the pics, first thought is that it looks like the leftovers of a good fermentation/karusen. If it ends up with a still white film across the surface it may be infected, but for now I say it looks fine.

In the case of an infection, if it's caught soon enough a good option is to add some crushed Campden tablets (1 per gallon), let it sit for a couple days and then repitch yeast. The Campden will kill pretty much anything alive in there. Should be a last resort though.