hard to get rid of the string algae this time of year tadpoles are everywhere!!Algae is most common this time of the year and should die back as summer plants take over. The water looks awesome and I would just twirl the string algae off with a stick.
Only thing is I wish it was not so cold this March. Looks colder than normal and were getting minus 15 to -20 degree Celsius at nights this week. Thankful that the sun is shining bright and that really makes the cold much more tolerable.