Ahhhh...Get rid of them or at least relegate them to salt mixing duties in a trash can, pumping water at water change time. Use them 24/7 in your tank....and they are an accident waiting for a place to happen, and it will happen, ie...burn up fail to pump and cause a flood as a result, have a "nuclear melt down" and nuke your tank for you as well as short out on you and electricute you or your tanks inhabitants (been there done that one! What an enlightening experience...nothing quiet as special as water and electricity. Its kinda like Rednecks + Alcohol + Guns ='s something really bad gonna happen :lol: ). They are cheap inexpensive power heads, and they are pretty good at working, but lack the quality needed for reliability and safety.
I know... there is someone out there thats going to get sensitive on me cause they have one and its been great for the last 10 years. Every dog eventually has a lucky day. The odds are way against that happening, Its much like roulette! The question is...Do you feel lucky?
I swapped all of mine out over a few months with Mag Drives or Maxi Jets. I am not going to say that they are the best or that they cant fail, but they will beat a Rio 8 days a week! Not that, that is hard to do when talking about Rio's. What really freaks me out is that many pumps used on several models of skimmers are Rio's! I mean, what was the manufactures thinking? Oh yeah, thats right, they werent!
Seriously though, get some piece of mind, and ditch the Rios for some better pumps as "fun dollars" permit. I promise you wont regret it. Do like me and let it be a learning lesson and do some research before you buy next time. The best mistakes to learn from are the ones someone else made, cause you dont have to feel the pain...too
!
HTH's