G13,
sorry, i didnt reply sooner.
You are right so far. the overflow box will come with u tubing.
this will feed the water from the front box to the back box. u will need an air tube to get the siphon going.
here's pic and hope this give you an idea. keep in mind the picture is a dual. you can just use one.
over flow boxes is cheap when you buy them use or on ----
about 30bucks
to get the siphon goin here's what you need to do.
get an airline tubing
insert thru the u tube until the one end is at the top center of the u tube.
now placed the u tube in place. both opening of the u tube must be submerge in water in the front of the box as well as the back of the box.
you might need to pour some water in the back box. keep in mind there will be a devider on the back box. one side of the devider is the drain hole to the sump. you want to place the u tube in the other side of the devider.
now to get the water to fill the u tube, just suck the air out and you will see the water will rise to the center of the u tube until there's no more air pockets.
in the sump use a submersible pump about 250gal/hr. nothing big. but make sure your overflow box is rated at least 250gal/hr as well.
do not fill the sump all the way full, just enough for the pump to be fully submerge
place the return line just slightly above the water line in you DT.
in case of power failure, you will have enough room in your sump to drain the water from the display tank to the sump with out over flowing. you will need to play around a little to set the height of your over flow box in your DT.
If you submerge the return line in your DT, when power fails, you will have a back flow. ( i learned this the hard way)
i hope this help. i know if hard trying to imagine it, but once you started to play around with it, you'll know what i'm talking about.
i hope i explained it right.
good luck.
i dont know where you live, but if you need help one day, i'd be more than happy to help you.
thanks
Junus
