I have a 10gal. tank that gets cloudy every time I fill it with treated water. I have cleaned it out with hot water each time and every time I put it together again it gets cloudy. I did this the other day with two tanks using the same mix of treated water and again this one tank turned cloudy. The other one is nice and clear. This is about the 5th time I've cleaned this tank only to have it happen again.Could this be a defective tank somehow? Has anyone else ever had this happen with a tank?