I have never heard of too many success stories with Lawnmower Blennies and hair algae, and them getting rid of it all. I guess depending on how much hair algae you have he may or may not go after it.
You can always sell your sea hare afterwards or lend him out, etc...
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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