its normal for them to go into the sand at night did it suck all the way into it self and harden up means you scared him dont warry about moving the sand off him when he does that he will move out of the sand the next day when your lights come on least he is not moving all over the place he will find were he wants to live and he will plant that foot close at night and open durig the day. the sign of a healthy anomone is when he is out and you touch him he will sqezz water at you or twitch when you touch him thats a good sign if he closes up when you touch him even better means he feels threated. when there small thay will suck up as thay get bigger thay will stand there ground


sorry about the miss typs and spelling