I agree with Ruth - Frogspawns (and other softies like that) will go yucky if you even TOUCH them (trust me, I just had to do some adjusting of mine in my main tank and it wasn't happy, shrivled like a big softball sized fist!)
Anyway - water changes, removal of problematic corals and such should help - the fact that your Xenia is doing so well is a sign that your tank isn't doing too too bad!
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