Update. I bought some Nutra Fin (Pet Smart brand) Bio Clear. At first I only added 10-15 ml at a time. It would get clearer. But not much. Last night I threw caution to the wind and put in 30 ml. The water cleared up completely in one hour! It is so clear that I am certain the fish get vertigo when they go to the surface and look down.
I read about Bio Clear on some aquarium forum.
Mike