I live in Colorado at 7800ft. where we are expecting another summer with West Nile virus lurking around. I would like to control the mosquito population on my 1 yr old, 1/3rd acre pond with BT "Mosquito Dunks" while I am getting my pond ready to stock with fish. Does anyone know if the BT will kill off all the insect (caddis, mayflies, midges, dragonflies, back swimmers)larvae or just the mosquito larvae? Or would I be better off with mosquito fish? Any answers or suggestions would be very welcome.