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When you're a large fish that can't reach those hard to clean places, what on earth do you do?! Well the large grouper has had to find a way to get clean and the small wrasse is an unlikely ally. At first, it may seem that the wrasse is taking its life into its own hands but the grouper isn't interested in eating it. The wrasse is actually cleaning parasites off the grouper's body. The grouper gets clean and is less susceptible to illness by having no parasites and the wrasse comes away with an easy meal!