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how much flow does a 55 gallon tank need to keep SPS coral in, as in how many power heads should you use and what size???
 

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I also have a 55G and am running (2) Hydor Koralia Evolution 1150s. I have one pointed up to move the surface water for oxygen exchange benefit, and the other is situated to so that it moves water lengthwise along the sandbed. I also have a minimal return from the skimmer return, as well as 1 smaller Hydor that i turn on at times to allow some added circulation to stir up more waste from the sandbed and in between the live rocks.
 

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I believe 50x your tank volume is the minimum for an SPS dominated tank. But most I've seen are higher though, anywhere from 70-90x.
 
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