This in a relatively new pond could be caused by a green algae (a good algae) as opposed to bluegreen algae which often causes most blooms in older very nutrient phosphorus rich ponds. One easy way to tell if it is bluegreen algae is to skim some of it into a jar or bottle. Cap it. Then several hours later open it and smell the air in the air space above the water. Bluegreen algae will smell very bad similar to moldy rank and terrible. Green algae does not usually produce rank odors but it could be sort of a fishy odor after a few hours.
Last edited by Bill Cody; 09/13/15 06:16 PM.
