Dan,
Just like Prkr314 said I too used inline 2 oz weights. The algae was pretty thick around the area, I especially noticed it in the afternoon. But I not only marked fish under the algae I did pick some up on the harnesses. I was not marking any fish outside of the algae.....coincidence?....maybe......but it was very sunny at the time??? By the way, I only picked up fish all day on the harnesses with Indiana blades and none on single or double willow blades or Colorado blades.
Jim