Tank Gravel And Palnts Covered In Black Algae

[fishnovice]

I have a large 5 ft outdoor tank, well cycled with very good filtration and goldfish been living there happily for a few months Black hairy algae has suddenly appeared and covered all rocks and artificial plants. What is it and is it toxic to fish? How do get rid of it?

 

[RadaR]

Already answered your question here. http/www.fishforums.net/index.php?/topic/333465-help-serious-algae-problems-in-my-tanks/page__p__2768717&#entry2768717

No, BBA is not toxic.