I've got a 60G 40x18x20 tank.
I'm running 2 MP10's. One on either end of the tank in anti-sync mode. I get really good random flow patterns, very few dead spots, and I can vary the flow depending on the coral requirements.
1 MP10 likely won't be enough for a 50G tank unless you are going for a full soft coral tank. If you want SPS you will need more flow IMO.
I don't think an MP40 is overkill for a 50G tank as it puts out just a bit more flow than 2 MP10's (both on 100%), but the benefit of syncing 2 10's together would be better than just having 1 MP40 IMO.
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