Pond Boss Forums MANAGING AN EXISTING POND Fertilization Plankton Bloom Started, Now Foam?

My guess from two states away and not seeing the 'stuff' first hand is you have an algae bloom that tends to be mobile in the water (flagellated - surface then subsurface) and the bubbles are from either oxygen bubbles from DO supersaturation or from dissolved proteins in the water (from lots of plant decompostion) appearing as surface bubbles from the aeration similar to a protein skimmer. One of the species of dominant flagellated alga is getting "caught up" in the bubbles when it is at/near the surface. It is possible that the "problem" algae is a Euglenophyta since some of them tend to bloom when dissolved proteins and the right nutrient concentrations are fairly abundant.