How do I get a non-toxic fish weed killer?
I have a small pond with a water falls. The weeds are growing in the rocks and impossible to control.I need a weed/grass killer that will not harm my fish in the pond. Tried just pulling them but it does not work . Also tried to burn them out but they come backstronger. Any suggestions on controlling the weeds/grass in the rock of my water falls?Most weed killers are toxic to fish so they cannot be used for my weed problem