Hello, I inherited a 10 gal. tank when tenants left it behind...I believe it is an Aqua Tech 5-15 filter on the tank...I cleaned the tank, refilled and after just 3-4 days it is very cloudy and murky again. I'm not sure if I have the filter placement correctly. Any recommendations or suggestions what to do or where i can find an illustration showing the correct placement of the filters....thanks, sac