I agree with Marie & think it maybe just acclimatising.
The only problem I had with these were with it out growing my tank & causing other corals to recede.
Good job it's easy to frag!
It needs medium level lighting & medium flow so keeping it to shaded areas may not really help it unless you have strong lighting ( I had it about 3-4 inches away from the water surface with 4 x 36w T5's)
If you can't find it in your inverts book it may be because it's often referred to as Cauliflower Coral or Capnella Sp.
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