have a pin cushin urchin and ive had it for for bout 3 of 4 months. Today ive noticed it turning its self upside down. Is this normal? I'M currently out of test strips to test my water quality, i checked it bout 4 days ago and everything was perfect. It isnt losing spines and it is actually growing some back from thoes that fall off from my LR. The spines are erect and are laying flat down. Any Ideas?