people really need to read the entire post... Levamisole is extremely rough on fish and those that are sensitive normally do not do very well. It definitely does not work that fast as far as the treatment because the treatment is over a 3 to 4 day period. It takes effect fast and you can often see worms being discharged within the first hour, but pending the parasite, it may take awhile. It will kill off shrimp and snails as it killed both in my tank.
-Just another day in paradise-