[JustDavidP]

I've used two different methods. If your tank is clean enough and has good surface chop, you may not even need or want a box. This is how I did my 26 bowfront where a box would have just taken too much room from my display.





You can adjust the elbow up and down, or really, left or right, to adjust water level. Only problem is, if it becomes clogged, you can have a flood.

The other option is just Home Depot Acrylic, a table saw, router for making the teeth, and Weld-On. And you can make boxes like this.







Dave