Fozzybear, I would leave it alone for a while. I would assume that your temps are fairly mild right now to have slush. The extra weight of the snow, water and melting may weaken the 3 1/2" that you had. Adding water on top may cause some rotting (swiss cheese effect) and a dangerous situation for you. If the snow melts and re-freezes you could end up with clear ice anyway and allow light penetration. Once it thickens past 6", you could then deal with the grooming for ice-skating. I'd play it safe and wait.
