The cause is apparently a phytoplankton bloom. This was caused by either not using ro/di water or using crushed coral substrate that was not maintained very well.

this appears to have been the solution: I added in a couple of comments that i italicized for you to make it more clear.

I shut off the normal lights, "I taped up the glass" (to keep all light out), "bought a uv light and the change was astonishing. In 5 days my water was crystal clear. Clarity that I never thought possible. Thank-you so much for your help. I can finally see my babies again. "

So, a uv sterlizer should do the trick.