i have a very small pond that has been taken over by a weed that looks very much like seaweed. this pond is or was a decorative pond and is only aprox 100'x50'.it is fed by the overflow from an artesean well and is high in rust and sulpher. i will try to post some pictures but any initial ideas may help thanx in advance

It could be curly leaf pond weed, post a picture and we should have a much better idea of what it is.