So I have new 10 gallon tank and got 6 fish to start with. One of my black molley's came with Ich. It had/has white specs all over it. So I went out and got "API Liquid Super Ick Cure". I did the recommended dosage and did the 25% water change. It looked like everything was gone, a few days ago it seemed to have come back and again is covered with white specs again. Is there a better ick medicine or should I try a different treatment?