There may be hope for killing Hydroids. Passing this on from another thread I am in.
I found this article on "r e e f 2 r e e f " talking about a complete cure for Digitate Hydroids:
http://www.*********.com/threads/her...droids.214950/
and one of our facebook group guys recommended it as it killed all of his hydroids by following the exact instructions in that post. he although said one of his GSP heads is dead which the method creator warned about. they say that you can use it in your tank directly if you isolate all snails and GSPs alone. attention should be paid when you isolate them not to take with them any digitate hydroids that could find a way back in your DT.
i got the Fish Bendazole of Amazon:
https://www.amazon.ca/gp/product/B00...?ie=UTF8&psc=1
and waiting for the package to arrive. ill use it on my tank and report back the results.
The other forum thread is here.
http://gtaaquaria.com/forum/showthre...86#post1482386