I got my crab about june 20 somthing and i did all my research on how to take care of it. but im worried that it is not molting. it has burried its self in the sand and i wached it for a day or two and it hasent moved. i know i probably sholdnt but i picked it up and under neath was little brown clumps. What are they? And when i picked it up i also saw that its legs just fell to one side and to the other. my crab sems lifeless and im extremly worried. what do i do?