tank is cycled about 2 months since. I have pulled on them and they don't want to budge, so there alive. It seems they are moving around at night. So I guess they are nocturnal. I had one in my refugium with lights on 24/7 never really moved much, turned lights off for a while he started moving around and eating so I moved him to the main tank and will get somthing else for the refugium. Thanks for the responce.