Works but use with GREAT CAUTION!!!!
This product is VERY toxic to neon tetras and killed ALL of ours within just a few days so I would not recommend using it in a tank with sensitive fish. We bought this product to clear up a callamous worm problem. We had only one fish, a male guppy, with very obvious signs of the worm. He ended up dying after just the first dosing of the medicine but we believe that was because we caught the problem late and the worms were already taking their toll on him. We went ahead and kept treating the tank for the amount of time recommended in case there were others that were infected that we couldn't yet see and there hasn't been any sign of worms since. I would recommend it for a callamous worm problem since it did seem to clear up the problem but just be warned that it is VERY hard on the fish as well as the pest so be VERY careful when treating with it.
Rating: 3 stars