I want to thank ya’ll for this input. It looks like as of now I will be going with a Gast 0523 pump with 5/8 weighed lines ( I only need 50 ft.)and two 9” diffusers.

Is there anything else that I need to know or do to get this job done. Now I need to start racking out my pond so I don’t have to spend as much on chemicals. I am really looking forward to start fishing in my pond , again