So I have a 40gal breeder that has been set up almost 1 year. Water parameters are ph 8.4 alk 10.6 cal.426 mag. 1230 phosphates .03 nitrates 5ppm salinity 1.026. Has 3 clown 2 damsel and a hippo tang. Also has a cleaner shrimp and about 10 blue leg hermets. About 2 weeks ago my water started getting cloudy and I couldn't get it filtered out. I did a large water change and it took care of the problem. For about a week. Now we are back to being cloudy again. Only thing that is new is the hippo tang but that is just in the last few days. I've ran it through carbon for a few days but still.cloudy. even did some clarity yesterday and it's no better today then it was. I don't know what is causing it all of a sudden. I haven't had any issues with cloudy water except on tank cleaning day when I clean the sand bed.