How to kill Hydroids?

organism

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#4
I've been battling some for about 3 years. Kalk didn't work, what did was putting that reef putty/epoxy over anywhere I found them. Now I only see one every 3-4 months and cover it up, before that they were everywhere...
 

organism

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#6
I just leave it there, every so often they'll still be alive somehow and start growing out of one of the edges, these things are awful.
 

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