I think I may have an answer on how the cuprasorb worked.
according to Bob Fenner Cuprisorb also removes Iron and Manganese from the water.
Algae-Algae-3reef Forums
What ever that green slime was it must have needed
trace elements which cuprisorb removed.
What is still puzzling me is why did the Algae or
cyano grow so fast with
copper in the tank?
Copper is used to kill algae not grow it. Its gone but I like to know the "why" if possible.
The cuprisorb does seem to work. My
copper is now almost undetectable in the tests. The snail test will let me know if its ready.