I think it is mostly dead decaying algae that you killed previously. IMO it is surfacing due to all the air bubbles in it which I think is gas from decomposition. Decomposition may not be rapid due to Cutrine also doing 'a number' on a lot of the decomposer bacteria in the areas that were treated. Cutrine and most algacides are not specifically toxic just for algae. Most all small and microscopic life forms are vulnerable to the copper.
Last edited by Bill Cody; 06/07/14 10:03 PM.
