signs of stinging

PONCHDOG2000

Anjuman
i bought a new hammer several days ago and i placed it high up and out of the reach of other corals. atleast i think. since i put it in, my leather coral on that side of the tank has been exhibiting strange behavior. at night its fur recedes and it shrings in size by atleast a third. during the day its fur is out and its at full size. if my hammer is stinging it what would i expect to see? thanks!
 
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