You've spent a deal of time and resources creating your backyard pond. You would like to sit here and watch the koi fly around in their crystal-clear water. However, the water is cloudy. Immediately, your pond is a deluge of green water and stringy muck clinging to the rocks. Through the haze, you could only see hazy silhouettes of your fish, sort of. The very first point to remember is that your water isn't genuinely green; instead, you're staring at millions of single-celled algae floating in it. Bacteria is not necessarily negative.
