In February 2014 I bought at a big garden market my new aquarium (180 liters). After running I bought in the same Mart 12 guppies (4 males and 8 females) and 6 armored catfish. After two months, there were first defaults on the guppies. Initially, I have dismissed as normal. After only 2 males and 5 females were alive, I discovered the likely cause the death. From the anus of the remaining animals could see red worms. On the internet I was able to determine the type quite fast. It was Fräskopfwürmer. To treat Nematol was recommended in various forums. I ordered the medium Amazon and applied as directed. The fish were mobile during treatment. The water turbidity described in some forums I could not watch. Even after one day you could see the dead worms were excreted. After two days, a 80 percent water change was performed. I repeated after three weeks to kill worms hatched from eggs This treatment. Since then, there have been no losses more. The guppies multiply again magnificently. A few days ago I did the dead animals supplemented by new purchase. The animals I have a precaution previously treated in a 30 liter aquarium with Nematol. Failures there was not time. My recommendation for the product.
