WOO HOO!!! It's up and working and plumbed completely into the aquarium. It's really amazing how the water in the aquarium got to a certain level and then everything just leveled off and has stayed at that level for the past few hours.
I unplugged the pump and let the aquarium drain to it's low mark, refugium had plenty of room to hold it. I plugged the pump back in and about 15 minutes later, everything leveled off right where I wanted it.
Then I closed the valves and stopped the flow of water from the aquarium into the refugium and let the pump run dry (then unplugged it). Aquarium still had plenty of room and didn't overflow.
WOO HOO!!!
MAN, THIS FEELS GREAT!!!
Next up, installing a float switch to turn the pump off if it runs low on water. Anyone know of a decent one? Thanks!
Also, tomorrow I'm going to pumb in and fire up my chiller. I think I'm going to put the pump in the first compartment that receives the water from the aquarium, let it pump the water through the chiller, and then bring the water back into the refugium and let it act like a circulation pump to "blow" water over the chaeto.