I've heard that you can dip them in a hypersalinity solution, like 1.40 SG. But, I don't know how effective this is. also seawaterexpress.com sells hydroid free rock and macros, just another option.
If you have a farm supply store near you, you can also buy it there. It is the same stuff seahorsesource sells. Look for the kind that is for Goats. That is the right one. You don't have to wait for shipping that way.
Hydroids can survive the hypersalanity dip. Panacur is about the only thing that will be 100% effective.
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