After fertilizing my water lilies with what I now know was not the best fertilizer (too high in phosphorus) I had an explosion of blobby, stringy algae in the pond. It comes off most of the plants easily when disturbed and I scoop it out when it floats on the water, but the hornwort is totally covered and it does not come off. The hornwort is brown and does not seem to be doing too well, it is so encased it just looks like giant algae blobs, and the fish eat algae elsewhere in the pond but they don't clean off the hornwort. How can I remove the algae from it to save it? If I try to manually pull it off, it just seems to shred the hornwort and pull off its leaves. Is it worth removing the hornwort from the pond and putting it in a bucket to treat the algae, then returning it, and if so what's a good method to de-algaefy the hornwort without hurting it?