I have shallow water floating algae...which is caused by less than 1
foot shallow areas in the pond. The water heats up faster in those areas
so algae grows before your eyes....no kidding!

In the afternoon you can see oxygen bubbles all along the shallows pond
bottom...and also see algae strings break off little by little. It gives
off tons of oxygen!
good for fish!

Solution...is to make the shallows deeper or...SHADE.....or put a
waterfall in that area to cool the hot spots.

For me in the summer I just shade it.