[southernstyle]

I have a 180 gal reef tank and its been up for two years now.
In the past month my water has been getting cloudy on and off.
Its really irritating me, I miss my crystal clear water, please help!!

It seems that this happens when I add fresh water or on a water change, but im not positive. I have not had this problem before. I have asked all my local marine stores and they have not been able to help.
My water tests are not all exactly what they should be but not far off. My nitrates are - 0
ammonia - 0
nitrate - 0
nitrite - 0
p.h. - 8.0
calcium - 380
KH - 13 dkh
salinity - 1.026
Is there another element that I should be testing that would cause my water to be hazy.
My livestock seems to be doing good, except for my pulsating Xina died off but I have other Xina that are growing and mulitplying.

Can anyone help me?