I have a 1/2 acre swim pond we put in a few years ago and It’s never had fish

It has a liner and is self contained as we sit-up on a hill


It was all woods when we put it in 3 years ago. The problem is it’s all murky now with a ton of frogs and leaves


Any fish that would help clear it up or any chemical we can throw in to clear it up?


We have an aerator and a fountain going ? Would another aerator help?

Thank you