Alright I do not have a day time picture but during the day I have a neon green film on my pond when its calm out or it is easily pushed to one corner if there is any breeze. Once the sun goes down I get this.

It turns to a grey film over the entire pond, there is one spot towards the left that it was still a little green when I got home last night and by morning the film will be completely gone only to restart as soon as sun gets on the pond in the morning. Ive never seen anything like this before, anything I should/can do about it?