why is my pond brown and not clear
hi i have 1050 gallon pond with two waterfalls, two pumps and filter boxes, but it is brown and not clear. pond has about 30 fish from gold fish, orfe and koi. it has marginals but have never been able to grow oxygenating plants get eaten too quickly. have a water lily. plus even though it does not have any overhanging/ shaded sides on two of them i never get any flying wildlife like damsel or dragon flies. do have frogs. what advice can you give me?