Originally Posted by Chellie4u2
I have a Rio 1100 in mine and it was a direct swap and i don't think its any louder than the stock pump, Im VERY happy with it...
Ditto, I have the bioCube 29 and I put the RIO 1100 in mine. I had to remove the cover over the impeller and get a larger Dia hose but it fit perfectly. And you cant even tell mine is running. In fact the cooling fans on the lights are louder and they are quiet themselves. Puts out almost an extra 100GPH than the stock pump too.