Quote:
Originally Posted by Jayson
I would use the M620 on 3 foot or less size tanks 4 foot and above I would use the m820 and for lots of flow use 2 or more. Thanks
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Would you use just one M620 on a tank less than 36", and get rid of the other powerheads in the tank

. My tank is 30"X20"x20", and does not contain SPS corals.