MJ1200 is 295 gph. With head loss, maybe 200 gph. You're looking at about 4x turnover and if you add a surface skimming attachment onto the MJ, you'll be able to skim off the oily crap at the top of your DT.
My 210g is served by a Sedra9000, which after head loss is at 6-700gph. That's only 3 times turnover per hour & it works for me.
You could use another brand of pump that gives you more flow but keeping it hidden should be considered when choosing what to use. If you can hide it in the back of the tank, so much the better.
Perhaps something like a Rio 1400 (3.9" x 2.5" x 3.25") would work. It's 367gph at 1' head loss & 333gph at 2'.
Anthony
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