I added liquid calcium but my big mistake and it is my fault. I did not test first. I learned from my mistake and unfortunately it was at the cot of my saddleback clowns. I have never had a problem with that tank until then. I sure appreciate the many responses of the people on this forum. The vast knowledge is amazing. I still have much to learn from all of you. I joined arc to learn and to make friends with a common interest. Thanks!