HI ALL , ABOUT EIGHT WEEKS AGO I PLANTED SEVEN NEW PLANTS IN MY POND USING AQUATIC POTTING COMPOST, ALL IN SIX INCH POND POTS WITH A 2 INCH LAYER OF GRAVEL ON THE TOP, OVER THE LAST WEEK I HAVE HAD EIGHT DEAD FISH , COULD IT BE THAT THE COMPOST HAS NOW HAD TIME TO LEACH INTO THE WATER AND BE POISONING THE FISH ??. I HAVE CARRIED OUT A FULL WATER TEST WITH A KIT AND ALL ARE READING S WERE AROUND NORMAL. ANY HELP WITH THIS MOST APPRECIATED.