Every animal "takes" something. I think you need to get over this (or not, it's up to you). How many of us would have a job if someone didn't need to "take" something.
People who "took" something from the Mariculture industry provided jobs to an impoverished area and added value to the reefs. Try a few Google searches to see whats going on.
Same goes for rock, sand or whatever... as long as it is done in an environmentally sustainable way. There's no way for me to know if this is the case, since I buy most things through several middle men, but again adding value to the reefs will encourage local governments to make good conservation decisions.
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