I noticed last week that my Oscar was getting ich and so I started treating him with Mardel Maracide. I also did a water change not too long ago. On the first day I noticed that the white spots had vanished and I continued to treat him. It's day 5 and now I noticed quite a few smaller white spots on him. What should I do now? should I increase the temp. of the tank and add a bit of salt? Any advice would be welcome.