Very fine green floating particles

[Usman]

does it look like this ? Watermeal

 

[chuckinnc]

Yes you have watermeal, it is impossible to get rid of, or has been for me. Tons of information about this weed on the web but no reasonable solutions. It will grow year by year and just get worse, at first mine would die out in cold weather but over the years has adapted and is now a year round problem.

 

[adavisus]

If it has a golden sheen to it it may well be a toxic algae. You might not want any pets drinking where the wind piles it up. On a breezy day you may find it all blown to one side, that would be good timing to apply a careful dose of copper sulphate where it is

 

[Stargazerwa]

It was not watermeal, it was much much finer. It has stayed gone, my guess is it was a Cyanobacteria bloom based upon the comments of others a subsequent research. Scary stuff with a toxic component. It's gone, the fish seem healthy. Thank you all