Hi Dave and to the forums!
There is another good thread going on right now about powerheads vs CL. http://www.talkingreef.com/forums/ge...reef-tank.html
What model of a Rio came with it? I had 3 older Rio 2500's that I rotated between return, skimmer and mixing batches of saltwater. One day the one I was using that week to mix SW froze up and spewed black oily stuff into my batch of water. I IMMEDIATELY bought new pumps to use in the tank and relegated the Rios for mixing SW. The 2nd one eventually quit but did not spew the stuff out and I am still mixing SW with the 3rd. I have been told that Rio corrected this defect on newer models.
Did your wife ever use copper (ie to treat ich) in her FW tank? If so I would be cautious about using it in your system. It would however make a great QT tank for fish.
Plumbing is my weak point so I will let the ones who know more respond with that advice.
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