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Whats growing out of my live rock


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Hi i have this, i think it looks like grass algae growing in my tank for some time now it is slow growing and its only growing on my live rock, when i try and pull it off it just breaks as it has hard straw like leaves and all that is remaining is a root stump in the rock which just grows back , i am just wondering what it is called? and how to kill this off as i cant show you in photo how its getting out of hand, I have a 90L nano tank with coral, live rock and fish. here is pictures, hope some one can help. post-45145-1295771765_thumb.jpg

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