Should only be a problem when you run out of algae. Once the algae is gone, so should go the Hare as it will starve to death. If it was to die in the tank you could see a problem, though still not likely.
They are reef safe, and they will eat algea like crazy... They usually only ink when dissturbed, attacked, or squeezed. The main problem people have with sea hares is that they starve to death, because they eat algea FAST. This may be of help http://www.seaslugforum.net/showall.cfm?base=captivi2
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