Jd, Is your caulerpa bleaching on the ends, or becoming transparent? If you have any red grape caulerpa, that is a likely candidate for the problem. Have you checked your amonia levels? Not getting the carbon bag rinsed good enough can also cause cloudiness in the water..
If you can get up here, we'll run a full parameter test on your tank water, and see where everything is for you.
Duane/Justin