I had one at each end in my 48" 120gal but ran them at very low speed as to keep the noise level down, they get quite loud at higher speed. One MP40 could run your tank at higher speed as long as you don't go over board with rock creating a lot of dead spots, depends on your noise tolerance really, good luck.
PS personal preference really but you may want to consider Jaebo RW8 I have a single RW15 in my 6ft 220gal running at 40% power with great flow.
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