07-27-2010, 04:20 PM
DTisme, my friend calls that stringy algae elephant snot. It's very difficult to control. Some fish will eat it. Tilapia do but they'll fill up on fish food first if given a choice. I agree with you. Let the hyacinths cover the pond surface for 6 or 8 weeks. It will probably be gone by then. The koi probably won't mind at all but you might want to talk with someone in the pond society first.