Rose Brain Coral w/hydroid colony

Marinne13

Northern Reefer
So I ordered some corals from vividaquariums, I acclimated them and put them in the tank(really pissed that they would sell a coral with this on it)...no I didn't dip them as I didn't have any medication

I noticed today a colony of brown looking feather dusters on the back of it which looked exactly like hydroids!! I thought they stung and killed coral? it was in the sand and atleast 7 inches away from any rock, do you think I am at risk of it spreading to the rock or does it need to physically touch the rock to spread?

I took the coral out as I don't want it to spread in my tank
 
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