Wow 2 Vortechs in a RSM 130! I have the MP 20 and just recently unplugged it. It's too big for my taste and detracts from the tank. I am probably going to sell it and replace it with a MP10. My few faults with the pump are...#1 it's really big (pictures are deceiving) and powerful, #2 it can't be aimed into trouble spots like a Koralia, and #3, I wish it had a power button on the power head that didn't loose memory settings so I could quickly turn it off for tank maintenance. The only solution is to un-plug it. Re-setting the memory is not that big of an issue. It's just that I have to reach way under the cabinet behind my chiller and ATO tank to un-plug it. I could have mounted the control unit in a more serviceable area but the last thing I wanted from my RSM adventure was a bunch of wires, tubes, and cords dangling from the tank so I went for the clean install approach. Had i had the opportunity to start over, I would not have bought the Vortech MP20. I would have waited for the MP10. Maybe for the RSM 250, size won't be as much of an issue since the tank is so much larger.