just bought a little red taild shark yesterday. i watched him in the dealer tank picking on all the other fish and there were no signs of glancing or ne thing so i picked him up. as soon as he was in my tank he was glancing off of all the ridges in my sand. however now that he is bagged and floating in the tank the glacing has stopped. are Red tailed sharks known to glance around for no reason??? or what should i do, hes a very good specemin with good contrast in colors