Thank you guys (snowboss,cyndrine, miami754,zambize, gumbii) for the fast replys !the white film is nearly gone now. I changed 10% of the water and I did turn my airstone full blast. I think I know what caused it! I did put a tablet in the water after set up with good bacteria in it. It says on the box of it to turn the airstone full blast for the next 24 hours but I didn't. Now I did.
It looks ok now. Thank you again you are the best ! Your replys really made me think !
I didn't know there were so many things could make the white film on the top.
Thank you !!!
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