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Message: [QUOTE="Paul Buccetti, post: 260538, member: 7302"] I garden in southern CT and when my pond finally was clear enough to see, I lost my two largest koi (17" and 21") and one or two smaller shebunkins. I have two smaller koi - one 8" and another probably around 4" (I haven not seen the 4" one yet) and handful of shebunkins. I have a heater in the pond and believe it's working. This year was one of the coldest we've had since I've had a pond. I've checked out some of the other threads and it looks like there could have been an oxygen or nitrogen issue. I'll get the water tested as soon as I can but does anyone have any other ideas? What should I do next year to help prevent losing any more fish? Thanks! [/QUOTE]