I run 2 of the regular units (not the nano ones)
With the newest models you can adjust the on-time (actually, it's probably voltage output) of the pump if you remove the unit from the case and use a phillips screwdriver
I have mine set to 250mL per shot
My sump level changes by 1/8"
My 20g QT changes by an amount I can't measure
In my sump I use both mounts. I have the 'eye' separate from the float and have adjusted the levels to be very sensitive
In my QT I use a single mount and the level is still very stable. We're talking less than 1/8"
HTH
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