I did the MJ1200 mod and it is 100% more quiet but I still do not like:
1) the dark acrylic - instead of
algae growth I get sponges, cannot see the bubbles, cannot use the return section for a reverse cycle refugium
2) return section difficult to work with - must move the collection cup to get into it, ie adjusting the heater.
3) cup adjustments - I like the rubber band adjustment on the CPR the remora I must fidget with everytime I move the cup
4) more difficult to clean - the CPR I break totally down. Unless some one kowns how I can clean the becket nozzle area and intake without screwing it up.
Even though the 2R has a smaller area I can still fit a heater, thermometer, several probes, and carbon bag. I have not tried a refugium for the 2R only the CPR 2.
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"It is not the size of your tank but the motion of your ocean." (at least that is what the wife keeps telling me)
My Itty-Bitty Reef site