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Maybe it's the iodine...

According to Eic Borneman in his book "Aquarium Corals" (pg. 121), he's talking about Pachyclavularia violacea (green star polps) and says...

"There are many reports of iodine additions (in the form of Lugol's solution) causing an adverse reaction in these colonies, often leading to a lack of expansion or even colony death. It is not known why this occurs, though the strong oxidizing properties and reactivity of elemental iodine may be involved."

You might want to cut back on the iodine and see if they expand better. Just a thought.
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