i will say that fishkeeper is right on one level, its wrong to use chems on coral or coral heads for ANY reason. in Keaulana's, the area my dad grew up in, he'd go diving everyday, because fish were that abundant, literally thousands swimming within reach(a quote, unquote renewable food source)
then people started getting greedy and used bleach to flush the fish out of the coralheads. the bleach would then deteriorate the coral head killing the animals inside the coral...no more growing reef, no more endless food source. now the reef is barren, and were lucky to see any fish. Makaha beach was the same way.
to this day when im diving, if i see ANYONE bleaching a coralhead in the ocean, ill drag them to the beach and beat the living $#!% out of them. the thing that pisses me off the most is that it wasnt a big corporation that did it, it was the people that lived in the area that were too stupid to know that bleach KILLS things.
*goes off to marinate in thought.