That should be fine for a 75 as long as you have more pipe on each end of the "t" with slots. I ran the wavebox with fresh water in the tank before I drilled the holes, I just marked the water line at it's lowest point and then drilled, nothing too scientific. Wow that's really cool! So you planned ahead(of course) and drilled the holes at the perfect height for what size wave? Also do you think if I made that 1" piece of pvc T that you customized, only half the size you have, that would work well for just a 75? Where do you have your pump returns angled in the tank with the wavebox? What kind of timer(aquacontroller jr? tunze timers?) do you have your Tunzes on? All your information is much appreciated and your tank rocks! My tank is only 18" front to back and I was able to fit the wave box and still have a nice rock structure. You do need to have at least 19" of space in front of the box for the water being ejected by the pump to get a good wave going but the box is only 4" wide so you can make a rock structure in front of it and just have the back of your tank open. It's hard to explain but I'll try to get some good pictures tomorrow to illustrate. This way the overflow never sucks air and when the water level is at it's low point the absolute surface of the water is being sucked down. It has slots on the very top and I drilled the tank so that when the water level comes down to it's lowest point the surface water is sucked throught the slots and when the water raises the overflow is somply under water. But in the tank I have now the water level flucuates over 3" so I made a custom over flow out of pvc. I don't think your going to get a big enough wave in a 4 foot tank to worry about your overflow box not working all the time, I never got any flucuation in my sump. I originally had it on a 4 foot tank and while it didn't make nearly as big of a wave as it did on my 5' and now 6' tank, it still did a great job of keeping everything suspended in the water column.
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