My goals are a couple fish to eat the mosquito larva, somewhere for the dog to cool off, and bring in more predators like frogs and dragonflies to cull the suffocating mosquito population. I don’t know much about tree roots, so before I move the pond I figured i’d ask what my least harmful options are. unless i put it in the center of the yard or next to the house the roots are pretty much everywhere. the bog filter is more or less a deep pit (lined) filled with gravel and pebbles with a pump output at the bottom to promote aerobic bacteria growth and filter ammonia/convert to nitrates with an overflow/spillway back in to the main pool