So my aquarium water is extremely acidic and I cannot figure out what the problem is (I have guppies so its better to have a higher pH). Some users suggested to try adding crushed coral in your power filter. I bought some crushed coral today, but was wondering if there if there is a certain way to add it to the tank. Do you add it gradually each day? Or can you just fill up a filter bag and simply place it in the filter? And how long will it take until the pH starts to increase? I have a 6 gallon tank with a pH at 6.0.