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. We will be updating our website very soon with new products.
Regards
Harold