LonnieG,
First things, first! You need a better diagnosis. Don't assume algae is a problem, yet. Need further analysis. I presume you are near Wadesboro, NC from your info. If so, your pond is likely "black water" meaning acidic. You need water chemistry checked and I recommend a site visit by a professional pond management company. You can take a look at our Resource Guide https://www.pondboss.com/Resources?lci=5

I'd recommend contacting Foster Lake Management not too far from you, or Quality Lake Management company in South Carolina.



The "oil slick" needs to be properly identified before you do anything about it.


Teach a man to grow fish...
He can teach to catch fish...