I have a rsm 130d, Isn't the brands you have almost the same thing? (Asking cause not sure of a quality difference) Other than that I tossed the stock skimmer due to the noise and issues but in replacing it found that you have to have an ato on most nano/nano skimmer combos to keep it regular. Also the Ph seems a bit low when all closed up due to the poor air exchange. I use the rsm fan and removed a flap anyway to accommodate the new skimmer to help the problem. But any issue with the rsm I have had can/has be corrected by a relatively simple upgrade here and there.
After reading up just now on this popular question, people like the rsm for its look and high quality vs the bc. Yeah that 5 extra gallons is nice and the tank is built well, mines been going since 2011. With a few upgrades like media basket and skimmer its really clean too, I have had minimal problems other than issues with nutrients I caused (nutrient export in the back is a pain without a media basket and regular cleanings). The fans go out eventually (but easy and cheap to upgrade and replace) and lights need to be replaced 9 months - 1 year, algae grows well after that. I added more lighting, the moon lights are terrible in the rsm but it needed a small boost for the light hungry corals anyway, stock lights can keep about 80% of coral. You cant keep a sump inside due to the mdf stand, but you can build a real stand and add one later.
Final verdict, at first I would have thought you should keep both tanks but after reading and realizing the rsm does has its advantages. What it would come down to is how old is the rsm/what version and is it used and or have any issues. I personally wouldn't trade my rsm for 2 new jbj/oceanic bc's, but that's because its issue free and its been a great tank. Hope that helps, feel free to pm or post any rsm questions. My Tank progression is here
http://www.marinecolorado.org/forums/showthread.php?26091-Bill-s-back-to-the-future-34g-RSM-build! , the words are useless and boring but the pictures are cool
