After some consideration I have decided to add crushed coral to my freshwater aquarium. I put in some threads about my dillema. Now my ? is how much do I add,so far I only have 4tsp in my mesh bag. The first 2 did not do anything I am now waiting for the 4 result. I also would like to know exactly how long it takes for it to rise and when to test. I've been waiting 2 hours each time. My ph level was 6.0 after my water change this morning, I only want to raise to 6.2 right now,but my goal is 6.6 and steady.