ok i leave for a few days to my grandfathers house with a cycling tank. i tell my sister to do a water change becuase the tank needs it. i have no idea what she does. i come home 3 days later and the tank is a quarter empty and it is so cloudy you cannot see anything. my squidward house ornament is laying on the floor and my amazon sword is half uprooted. what happened?? why is it so cloudy???