Bill Cody said it right, that species is know to have the capabilities to produce the toxin and this strain may not have enough toxins associated with it. They also carry different strains of toxins from simple skin irritating toxins to the most dangerous of toxins being neuro. Those are typically seen in the Outback.
Ted nailed it that if you were to simply install two diffusers not at maximum depth at both ends, that will be more than enough to open some holes and not compleletly kill the algae or super cool the pond. Ted is the cold water aeration expert with his experiences in his own ponds.
