Replies from Charles Harris via email;
Flubendazole is indicated for Protozoa.
Levamisole is indicated for Nematodes.
Although Flubendazole is a broader treatment medication, it takes longer to work and is more messy to work with than Levamisole which is much more soluble. Flubendazole will kill snails effectively. As far as the rest of the life forms it remains unknown but I have not had a problem with a bacteria kill. On the other hand a lot of dead snails presents a problem with a bacteria bloom.
Levamisole won't touch Protozoa or bacteria making it good for the tank Nitrogen cycle, etc.
5 grams of Levamisole treats 100 gallons and we could have saved all those fish last year with just a few grams of the stuff if I were more visible to people in need.
With the volume of water you have and the fact that Nematodes are the most likely to sneak up on you, I would recommend 6 - 5 gram packs of Levamisole and 50 grams of Flubendazole 10%.
That information came to me September 2010.
Since then Flubendazole, Metronidazole and Levamisole are all used as part of my entry quarantine program along with the time to complete all the treatments. (30-45days) No quick trips to the LFS and plop and drop here anymore.
Flubendazole is a two course treatment. Flush the system (full volume WC and tank cleaning), dose, flush the tank with another large water change, and a second treatment followed by another big water change.
Using the 10% Charles sells and I have tried several mixing methods.
Mixing Flu can be a challenge The best method so far (Hee Hee,, hick up
) came to me on TAFF II. A member uses near boiling water for premixing the powder. Another member posted using a splash of vodka added to the dry powder (happy fish). Then adding it to the tank. Mixing for my 20L planted quarantine I tried a combination of both. When I added .5ml of vodka to the 1gram of powder in my scale glass it dissolved instantly. Before I've always had some trouble mixing the meds into the tanks. The powder seemed to want to float a good bit. Even mixed in with 2 cups of scalding water it filmed for several days but not as bad.
Mixed with vodka then hot water there was no issue with it mixing at all. It dissolved into the water column in an instant once cooled.