I wouldn't call any aquarium-kept species something that could be released back into the wild -- once they have been in our care, theres too much possibility for minute biotia that doesn't normally exist in habitat being communicated into it. The show Ace mentioned the other day about Caulerpa is a prime example of this -- reintroduction can introduce far hardier, not-quite-native, far more invasive species into the waters.

As far as the cleaner wrasse goes -- honestly, if Bob is that reactive to the cleaner Wrasse, its probably more stressful on him than its letting on.. I'd keep an eye on things just out of fear, myself

-Corruption