What type of algae

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maxlab76

Aquarium Advice Apprentice
Joined
Mar 15, 2011
Messages
26
Location
Alamogordo, New Mexico
I have had my 55 g tank for about three years. When I lived in California, I used to get this green algae that was really hard to scrape off. I have since moved to New Mexico, and now I get this black algae that usually will spray right off. Does anyone know what kind of algae it is, and why it is different?
 
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