So i got my 75 setup with filter running. I bought some ammonia from wallmart. It seems to be just basic clear ammonia. Well I don't know what percent concentrated it is because it does not say. So I added a capful and took a reading about 6 minutes later. I think the ready was between 2-3 ppm or w/e, it was hard to tell. My question is how long after you add ammonia should you check your water? And does anyone have any experience with Clear Ammonia all purpose cleaner from walmart? It says GREAT VALUE on it and is 64 fl oz or 2 quarts. Ingredients are Softened Water , AMMONIA, and Chelating Agent. Contains no Phosphorus.