I have a 40B and I'm running an MP10 as my one and only powerhead. I have a mag 3 that's my return and that's it. I don't have dead spots with the MP10 that I can tell. Nothing on my sand is indicating it.
If you're buying a new pump for that tank, I'd probably get a MP10 personally. If you already have a MP40, stick with that and just keep the flow turned down.
At first my thought is that the mp40 is too much for a 24 x 24 x 12" tall tank, but I have 2 x 6055 tunzes on my 30" x 18" x 18" zoanthid tank, and every once in a while I'll add a tunze 6045 for a week or two.
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