I have a 55 gal tank and my water is cloudy. Per the local fish store i needed to do a partial water change (20% min-40%max). I did that and the water is still cloudy. My water parameters are: ammonia 0, Nitrate 40, Nitrite 1.0, water is hard (i live in the country and have well water), chlorine is 0 (well water), alkalinity 40 and ph is 6.2. Now i have another tank that is 29 gallon tank and the parameters on that one is ammonia 0, nitrate 40, nitrite 1.0, hard water, chlorine is 0, alkalinity is 80, and ph is 7.2 and this 29 gallon tank is as clear as a bell. what do i need to do to the larger tank to clear up the water? any advice is greatly appreciated. Thanks