Do a search on the florida / caribean projects to reintroduce diadema to their reefs (>90% lost due to an epidemic decades back). Little question as to their effectiveness at reducing annoyance algaes / macroalgaes, and reducing silt deposits on the reefcrest. Allowing corals to repopulate the reef.
In my little 3g - (s)he's making a massive dent in the bubble/hair algae infestation...
Like Tony said - the tuxedo / pincushions are rather annoying in relocating your frags (especially zoos) for you.
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