Will a cloudy fish tank.........?

Would my 40 gal fish tank get uncloudy by changing about 8 gallons a day outa It with freshwater? I do I have to buy some stuff? Is the cloudy water high ammonia? I tested it and nothing seemed to bad? None of my other tanks are cloudy? I have one big plant in their and a piece of drift wood. I thought the plant ('s -in the future) would make it so I have to do less water changes