Importance of power heads?

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why is it so important to have them in a tank? what do they do and how many should i have for a 30 galleon tank?
 

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how do you figure out how much you need? and what is "turn over". and this that 10X turn over/ 300 GPH for my 30 galleon?
 

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will powerheads placed on both sides of my tank help with some red slime algea and green algea i'm having in the middle of my tank?
 

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about 2 months. and my light is 130 watts and is on 12 hours daily for my anemone so i can't take the hours of lighting down
 

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my 30 galleons being small i hope, and do you have an email address i can have or a instant messenger name i could have for any other question i will have in the future
 
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