I run a MP10 Full Blast Reef Crest Mode on my 29G Biocube. They are impressive but not really for a 210. I would say two MP60s would be ideal. But Money can be a huge factory in that.
that said, yeah 1 MP40 probably won't be enough. With next to no rock structure, it may get water moving around enough for a low energy system, but I run 2 MP40s and a MP60 on my 180 tank.
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