Still dosing and having great results, I'd estimate probably a 75% reduction in algae, calciferous algaes are doing fine. Reduction is very obvious without any spot treatments.

No ill effects for livestock so far which includes some starfish, urchins and two lone snails that managed to survive the original GSP apocalypse. My rainbow monti that was getting snuffed out by algae and shade from a toadstool is coming back with a vengeance now.