Yeah, search for Fluke Tabs. I think this is one of the treatments that is recommended, even though it does not list hydras,
http://www.drsfostersmith.com/produ...lpartial&Ntx=mode+matchallpartial&Np=1&N=2004
http://www.drsfostersmith.com/produ...lpartial&Ntx=mode+matchallpartial&Np=1&N=2004