:look: HI I AM NEW TO THE WORLD OF TROPICAL FISH SO WHEN I STARTED OFF MY TANK TWO MONTHS AGO I JUST ONLY PUT FIVE FISH IN IT TO BE ON THE SAFE SIDE.(2 CHERRY BARBS, 2 SOUTHERN PLATYS AND 1SHARK. I ADDED 3 GUPPYS TO THE TANK THREE DAYS AGO AND ONE BY ONE THEY HAVE DISSAPPEARED WITHOUT A...