Please help diagnose my hammer coral

misosoup365

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Hi all, my hammer coral has been doing fine for the longest time (6 months). Suddenly there are like these brown spots growing on it. General googling suggests flatworms, but does not seem to be the case as it doesn't moves. Seems like it is spreading a little. Any advice please.

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hi, cannot see them very well, could you post picture with white light ?
 
Not a flatworm but may be a nudibranch. Remove coral to a container of tank water and Carefully remove with tweezers or dip in coral dip
Could also be ostrapods. Dip will again likely eradicate
 

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