For green water treatment, view this article: http://support.aquascapeinc.com/hc/en-us/articles/201039830-How-do-I-get-rid-of-green-water-
For string-like algae, view this article: http://support.aquascapeinc.com/hc/en-us/articles/200974294-There-is-a-string-like-algae-on-my-rocks-and-waterfall-What-product-can-I-use-to-fix-it-