Keeping A Betta Fish ? Nano

The film on the water is easily removed. Turn the filter off and let the water stop moving. Then carefully lay a paper/kitchen towel flat on the water, pick it up at one end and drag it across the surface to the side of the tank and lift out. Repeat till it's gone.

Provided the tank is cycled is there have been fish in the tank or you've done a fishless cycle with ammonia, the tank is fine for a betta. But look at the speed of the water coming out of the filter. Betta's don't like fast moving water because with those big fins it is hard for them to swim against a current. There are ways to slow the current down.
I think other members have Aquanano tanks and should be able to advise you on slowing the filter outflow.

 can anyone with a tank like mine give me some advice on slowing the pump down ?

it is a pump that has suckers on and the outlet  comes throught the was seperating the back compartment . it does have a  volume to turn down but still a lot of water movement 

and yea the tank has had no fish at all

So you've done a fishless cycle then?

Otherwise I don't think it would be a good idea to cycle the tank with a Betta in.

Those that still insist on doing a fish-in cycle tend to use a few small cheap fish. I personally find the practice cruel and immoral.