I JUST BOUGHT THE RIO 800 YESTERDAY AND IT DID NOT WORK FOR ME ON MY BAK PAK. IT CAUSED TOO MUCH WATER FLOW. IT BROUGHT THE WATER LEVEL UP TO THE OVER FLOW AND CAUSED TOO MANY BUBBLES IN THE TANK. WHAT HAS WORK FOR ME WAS THE AIR STONE UPGRADE AND HOOKING AN AIR PUMP DIRECTLY TO THE RIO 600 SO YOU INJECTING THE AIR INTO IT. YOU CAN NOT GO FULL BORE ON THE AIR AS IT WILL OVER POWER THE PUMP. BEST IS TO USE THE VALVE THAT COMES WITH YOUR RIO 600 AND ADJUST IT ACCORDINGLY
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