The weeds are only a problem when they restrict the fishing . But how in the world would you clear out that many weeds before fertilizing? Probably should just wait and then try to fertilize if the weed problem gets better. This has happened before and it tends to go in cycles. It seems that they come then go away on their own, but before I can catch the time to fertilize before they come back they are there again. I will put in some cutrine granules to try to clear up some areas. Not all at once , but a bit at a time. Anyway I know that it is a problem for a lot of pond owners and if you folks could come up with an easy solution for us novices we would pay for it. There are a lot of differing views on these weed, scum, algae issues.