As the last post said, they need to be moved a QT. Also need an idea of what disease it is, to suggest a treatment. Its sounds like ick to me but hard to say without a pic or actually seeing them. If it is a copper based treatment in quarentine would help, if its not to late.
Or if its in very early stages, improving water conditions by the water changes and Brads suggestion of garlic may help.
There are othere treatments like Melefix and the such, for other ailments, but most need to be used separate from a reef tank also.
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Doug
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