Hi ive had two clams for about 4 months. one a maxima and the other a crocea. Up until last week they have been perfect. last week though it started to open very little during the day and at night about half way open. when i saw this i checked that my dosing pumps were ok and sure enough the calcium was 360. im slowly bring it back up do you think that this is the cause of the clams behavior or something else.