This is my first crack at the clam world. Size is about 2 1/2 inches but was smaller three weeks ago. Didnt want to post just to have it die later on. No feeding maybe drizzle some left over reef roids from the mix. One thing I've noticed though are the blue patches on the mantle. The mantle when purchase was predominately tan/gold with black outline. I've read that if the mantle turns white, the clam is in trouble. What could cause the blue patches from emerging? The clam is about 3-4inches below water level with two ai primes on my nuvo 20. Thanks in advance.