I think you need to describe your setup a bit more.
Do you have overflows?
With my tank I have to overflows. I have 2 holes in each overflow on the bottom, one is the drain which is plumbed into the refuge and one is the return, again plumbed from the refuge (using the return pump)
With the return, again plumbed, it runs back into the tank through the bottom and then there is plumbing inside the overflow to take the return and run it out the front of the overflow, a few inches below the waterline. So there is also a hole in the front glass of the overflow for this.
I hope this makes sense and helps.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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