Once again I call upon the forum to help me answer a question/solve a problem. Yesterday I visited my pond which is located deep within the Missouri woods consisting of hardwoods and pine. While there I found a light green thin layer of "stuff" covering my entire 1/3 acre pond that was not there nine days ago. What this substance is I do not know. The days have been warm (mid-80's) and the nights cool (mid to low 50's) and water clarity is only about 9-12" now. The pond isn't normally fertilized although a light organic application was administered early in May. The pond is nine months old and has never had this issue before. I am perplexed. Could it be algae or pollen? What does everyone think and what do you recommend? I haven't the means to provide a picture. Thanks.