Thanks for all this info, sounds like the next thing I need to do is have the water tested. The
spring comes into the lake at the waters level, so I should be able to draw a sample for testing.
I think I only have the fillameatous algea, I really don't know what plankton blooms looks like, if it is a greenish water, no, the water is
very clear except after a rain.

Thanks again, this is a very useful site.
Mike