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I've never specifically seen one called a Hawaiian lawn mower but then again half your "common" named fish have "special" names. I'm wondering if your LFS juices the names to sound more exciting, don't worry it happens all the time. I can tell you that their is a lot of mimicry in the algae blennie tree. There are a couple that are terrific algae eaters, and then there are a few that eat corals but confuse everyone enough to look like the harmless ones. Keep an eye on it for a few eeks. If any of your corals show signs of stress, plan to remove it. I've got one and it does a great job of helping keep the glass clean. I want to point out to others that they are not the catch all answer if your tank is suffering from an algae or hair algae problem. They prefer to eat only the newest and thinnest crop of algae, IE: from the glass. They completely ignore large patches of existing algae, as do many of the so called algae eaters IE: tangs. So if your tank is already having a trouble with algae they won't help. Only super low nutrients and the cleanest of water wil help starve off the algae. Then a lawnmower will help prevent it's return.
 
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