Flow Rate Closed/Open Systems

[Myka]

Hmm, weird. I've always found the Mags to be much louder than the QOs - especially the bigger Mags like yours. My tank is almost silent...the only thing I can hear is the Tunze 6055 ramping up (it's on a controller) and the Wavebox pump kicking in. Not even a hum though, just barely a sound. Can't hear the skimmer, the overflow, or the return pump.