Hello there, I am battling low ph/kh. I have a well planted 55g tank. It also has 2 granite caves, slate, malaysian driftwood, shells, and a man-made limestone look-a-like (petco). I use a penguin 70g filter with sponges only. My ph from tap is 7.0 or 7.2 I have some sitting out degassing to test, but only 12 hrs. Should I be degassing tank water too before testing? Tank water Ph reads between 6.0 and 6.4 (it was 6.0 orginally), Kh <1, and a Gh 28. I add prime, flourish, and special blend weekly. I add kent's calcium daily for my snails. I put approx 1 cup of crushed coral in my tank on Saturday and added some large shells in the substrate Thursday. I have read it takes awhile for crushed coral to work it's magic; however, I am worried that so far the results have been negligable. I am also confused as to how my Kh is so low when I have been adding Kent's Calcium daily for a few months now. I do 30% water changes weekly. I had a Nitrate spike last week so I have been doing daily 30% water changes. It finally read at 40ppm this morning. I would like to see 20ppm, should I do daily changes still or go back to weekly? Sorry for so many questions I just want to get my fishes in a higher Ph. A few of my fish prefer 7.0 - 7.5 so I would ideally like to bring my tank slowly up to 7.0 or 7.2 without using more daily/weekly additives if I don't need to. Thank you very much in advance for you help!