what size of powerhead

marty7975

Reefing newb
I need to purchase a powerhead can anybody suggest a size and how many.I'm going with the hydor koralia.I have a 55g tank 36L18W20H.
 
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Is there any kinda of forumla or suggested ratio to follow when deciding on powerheads?

What is the danger in having too little flow? Too much?
 
Some people say you should turnover at least 10x your tank volume in an hour. Others say that you can never have too much unless you start disturbing the sandbed.
Too little flow could result algea outbreaks in the low flow areas, and also food, detrius, and waste not being carried into the overflow due to lack of flow.
 
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