[Maverick00]

Originally Posted by Leon71

I read this somewhere on the net, just not sure where.

Fill your display tank until it starts to spill into the overflow and down into your sump. Fill sump until 1" from the top. Start the pump and wait for everything to level out. Mark this level on the sump with a marker or tape that won't come off easily. This is your absolute top level. Do not fill beyond that line. All is good.

Leon

i was just thinking about this technique which is a great baseline. However IF you have your intake nozzle/s a few inches below the waterline or more make sure you have a "siphon stop hole" near the surface. When you first fill your display tank up to the overflow all is fine and dandy, until you turn on your return pump which will create a back siphon to your sump if the power should cut out. If your running a small sump with a large display tank combined with lower than waterline returns, a 1" safety net may not be enough. Just something to think about..