How many MP40's

You will need 40 of them :P The amount flow depends on what corals you want to keep. I would recommend at least two of them, one on each side of the tank. Will there be an overflow and return?
 
Hmm I unfortunately think you will need a second power head
 
I have had a 36" 65g tank for four years now with one MP40. I have kept all types of corals including mostly SPS and some LPS. I get plenty of water movement and a nice wave on the top when on nutrient transport mode.
 
Vortech has a chart on their website to show you how much flow a mp40 will make and how much your tanks volume would need. I personally think one is enough. I have two on a six foot tank with softies, lps, sps corals.
 

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