Dog Dewormer for killing Planaria/Hydra

I know this is an old thread, but I was wondering if anyone knows if nerites and briggs would survive if something more thorough than multiple water changes was done. If so, what do you suppose might be necessary:

Same gravel and live plants but rinsed?
Completely new gravel and live plants?
Completely new filter media?

Or is it like copper and no amount of cleaning will address the problem?

Trying to figure out how to make a snail-safe tank as I have treated several tanks with flubendazole and observed the same results as Sounguru. My tanks are not nerite/brigg safe, more than 6 months and several complete water changes after treating them.
 
im not sure what the minimum time is, but I added nerites back to my 10 gallon 1 year after stopping doses and they're still going fine.
 
I had some fake rock structures and some coconut huts that were pretty contaminated it seemed, by the reaction of the nerites. I would pitch the gravel, plants, and ornaments. The remaining will be diluted enough after several water changes. You can still use the tank after, in my experience.
 
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