I personally wouldn't worry about it. It sounds like some kind of precipitate associated with a new pond (sometimes thing leech out of the soil intially when a pond is new).

As far as the hardness mine must be hard enough to get the ice fishing gear out (362) (LOL). Acutally low hardness is more of a problem when it comes to fish than high hardness. Hard waters produce better fish growth. Soft waters have all kinds of problems.

I wouldn't treat for algae if it is not that big of a problem this early in your pond's history. Why add copper if you don't have to?

I had quite a filamentous problem in my new trout pond a year ago, and now the rooted plants and suspended plants are uptaking the nutrients and the algae is virtually gone.

If you are not having any fish health problems I would just give it some time.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.