I bought a product to rid my small pond (1/10th acre) of cattails and to control floating heart. The company that makes it is PBI/Gordon Corporation, and the product is called Pondmaster Surface and Shoreline Herbicide.

The active ingredient is Isopropylamine Salt of Glyphosate, and it contains surfactant.

Any opinions regarding the product's effectiveness and its possible toxicity to ornamental fish?