foggy water

I have a 10 gallon tank. I have a biowheel filter system. My tank was
having an algae issue for some time which water changes wouldn't fix. The
stones were several years old so I thought perhaps this was the issue. I
changed the stones yesterday, and took out three gallons of water as well.
The water now 24 hours later looks clean but there is a fog look to it. The
smaller fish (tetras, catfish) are acting fine. The large angelfish while
swimming around and acknowledging me when I walk into the room, will not eat
and is hanging around the top of the water quite a bit (though not gasping
at the surface). What could be the issue with the foggy water? Is the
angel probably just stressed some? I will do a test on some of the water
parameters and post them separately.

water parameters a
Ammonia 0 ppm (no surprise there since the tank is so clean, new stones,
etc)
Nitrite 0 ppm
GH & KH rnage 50 ppm
pH is high at about 7.6 (usually it is 7.0)

Could this pH spike be causing the foggy water and the angel's stress?
Will the tank cycling with the bio filter fix this on it's own?