I have had this maxima clam for 7-8 months now. It has always been extended and attatched to a rock in the same spot, well I moved some corals around but did not touch the clam. Now it's been 2 days and he has not extended his mantle nearly like he should. I created a clam lagoon in the center of my tank for him and my squasmosa. He still isn't extending. How long should I wait to see extension? How many times should I move him to make him happy?THANKS!!!!