Ok thanks guys.But now it is getting bigger,now the black is taking up the whole top half of the carboy.I think It's all going to turn black.Weird.
i'm not sure what your concerned about? the yeast is settling out, this is absolutely normal behavior for most beers. the only thing different is that it's taking longer to do so.
i made a tripel about 7 weeks back, it did exactly this during secondary. at bottling time, it was all settled out.
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