How could I get rid of Grape Macro Algae!

[arash53]

Thanks for the advise ,the problem is the rock is covered with blue mushrooms and I dont want to kill them. I poll them as mush as I can every couple days but these things are really fast grow, currently they are only on one rock.
my emerald carb dosent toch them and I cant have tang in 34gallon and I cant boil the rock and kill all the mushrooms thats way I really dont know what todo ,
My LSF told me they are beneficial for the tank and people buy these algae from them and they have some in their Show tank !

But I just want them out of my tank