I have been adding Kent A and B Calcium supplement once a week for about 3 weeks, my sg is 1.025. PH 8.1, temp 80.4. My Ak is 3.89 (dkh 10.9)but my Calcium is way high at 640, is this abnormal or dangerous? Should I stop using the A & B or can I use just the alkalinity part? The tank is 100gals...