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Some of my zoas seem to be losing color. Multiplying like crazy just have no color. Is this due to bleaching? Or is this just what type it is? How do I safely get rid of then or thin them. They used to be mostly the color of the one in the upper right.
They look like button polyps! A royal pain! I thin mine with scissors every month! The colour is dependant on light intensity, but they don't get much better!