Hi, I am a new hobbyist and am having lots of fun setting up my tank and picking out fish I want to have, however I have had a few problems so far and now this one, my black mollies have ICK. I started the tank with four mollies and I am down to two now. I am treating the water with Quick Care (the Aquarium store worker said to use this.) However, he also said to only use it for 5 days, but I have read to continue the treatment for up to two weeks. How long should I continue treatment?