help with algea

[craig_will2513]

hi all.. i have some almost white like alge growng all over my tank its on the sides and on my live rock. its covered the purple stuff growing on my rock and looks horrible. some is almost white some is brown and i saw some green stuuf in there to.is this bad stuff and how do i get rid cuz its horrible looking. i also have loads of polyp like things growning all on my rock but this hiddious stuff has covered over them.. can someone help please.

[Dinodu]

well do you test your phosphate? buy a phos sorb if is not 0. thats my 2 cents

[craig_will2513]

ok so its phos thats causing the problem its stopped spreading now but how do i remove it as its not very nice looking