Hi Mattloui
Regarding the weekly water changing, you don't have to do it weekly. You can apply Filter-Aid for treating the water. It takes about 1 hour to clear cloudy water into clear water. You can apply for 3 times before you do a water change. Normally 3 times is approximately 11/2 months. The reason we recommend a water change after the 3rd time is to reduce the level of nitrite and Ammonia in the water.
If you need this product you can contact us at
cosmos@cosmos.com.sg.
We also have other products for fish diseases. We do not use any Antibiotics or hazardous chemicals for treating fish diseases. You can visit our webpage at
www.cosmos.com.sg
Regards
Harold