I HAVE JUST NOTICED THAT ONE OF MY FISH HAS A RED SPOT ON ITS BODY THAT WAS NOT THERE YESTERDAY. I HAVE A YELLOW WRASSE (RED SPOT), PEARL GOBY, AND ONE OF THOSE ORANGE AND BLUE FISH I THINK A PSUEDOCHROMIS , A BABY BRITTLE STAR AND A QUEEN CONCH SNAIL, IN A 46 GALLON. DOES THE QUEEN CONCH...