Help me out guys, why is this stuff turning yellow on me? I noticed it last week, a small amount of grape caluerpa that got intertwined with a clump of cheato was yellow. Didnt think much of it, just ripped it off and chucked it. But today, in the 2nd section of my 55 gallon fuge where I have the bulk of the caluerpa, about 20% of the macro had gone yellow. Is this bad? Does it just mean there isnt enough nutrients to support it? IS it dying? What can i do to fix it, just prune out the yellow stuff?