Water question !

[Mr.Pellander]

I have kind of a film on my water, dont know if it os the right way of saying it (i'm french)

[AlSimmons]

How old is the tank? Sometimes that "muck" your seeing is normal. For a quick fix though you could place a paper towel down flat on the waters surface. (very carefully) Once it becomes saturated remove it very slowly.

Btw, do you have a skimmer?

[LuizW13]

Maybe you don't have enough surface agitation.

[mcgyvr]

Its a "protein film" common on tanks without overflows to "suck" it down or enough surface agitation to knock it back down into the water..
They sell "surface skimmers" to help remove it and keep it away..