I'm not advocating he fertilize, as to be honest, I never do. The idea of adding nutrients to try and encourage a bloom is so far removed from my thought process that I never considered it. Around here, we just don't need to do that. I agree with esshup in that the existing plants probably have the nutrients tied up for their own utilization, leaving little to establish a bloom.
Whether or not the water can be too clear? I still think a lot depends upon the goals for the pond.
