Landshark, fertilizing may not help and even create new issues if the water is "muddy". There will be no sunlight penetration to create a healthy bloom, but your are likely to grow huge amounts of FA.
Considering your lake is spring fed, yet muddy, my first thought is lots of bullhead catfish or common carp are stirring up sediments. Have you ever done a "jar test" (leaving a glass jar of lake water undisturbed for 5 days) to see if the water clears???
Also, if muddy, and no planktonic algae, what are TFS going to eat???
Last edited by Rainman; 08/29/13 08:19 AM.
