In the same way, the newly released first stage swimmers don't just die because they don't find a host, they just molt into the next stage and wait for a change in conditions. However ,this Nematode has not been found in mammals, so seldom worry there. (Don't go there)

The so far best treatment for the Nematode is Levamisol HCl, and yes I keep it for those in need. But forget the hospital tank or isolation. Once found in any environment it means it is in most everything that has common nets and nearby location. This is a facetious and infectious parasite. Only serious work to eliminate it is successful. I have helped many to kill off the noticed infestation only to be called upon later that year to provide more medication to take care of a new out spring without any additions of fish or plants.

The affect of Levamisole upon plants is minimal if at all. No one has ever mentioned it and I have never seen a problem. Frogs on the other hand offer some new territory and I would be interested to hear back the effect on them. As far as I have had reported, frogs are not suitable host. That advice I wouldn't trust. It is untested as far as I know and I have been through just about every paper publishes on this group of Nematodes.

 I have had some positive reports regarding cat fish and loaches that the drug of choice is not lethal . . . frogs ? don't know. I would treat everything that has had water and fish in it. Bleach and a good scrub down is an alternative followed by drying for 5 to 7 days. Lots of fish keepers use gravel and that really needs to be treated or pitched along with other tank decorations.

Right about keeping the filter and circulation going and remove the Charcoal! That will take out the medication. The water needs to move some to circulate the medication.

So many fish have been lost to killing the parasite within the fish that this needs to be mentioned. The death of a lot of intestinal parasites is often too much a load on the fish. The bacteria build up in the gut and there is no way to clean everything out. The use of live foods is important just to keep everything moving.

The next item which kills off a lot of fish is fresh water. So many tanks have had  no changes for months (18 to 24) and fresh water and a change in pH and salt concentration damage the gills so severely that the fish - even if the Nematode is removed, the patients die.