<a href=showthread.php?s=&postid=6497410#post6497410 target=_blank>Originally posted</a> by MiddletonMark
Skimmer might be overloaded ... one thing I would do, is to test your freshly-mixed saltwater [for a water change] for phosphate.
That should tell whether it's just the water, or it's just the water in the tank.