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I've run into a small hair algea problem and thought a lawnmower blenny might help solve the problem - not to mention they have a neat personality. Anyone seen one in Calgary?
Also I don't have and substrate is this going to be a problem or do they care?
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My blenny wouldn't touch GHA, but maybe you can find one that will. I never had any problem with mine in a BB at all. Another critter you could
consider is a sea hare.