I am planning a DSB that will sit above my tank. I am toying with the idea of building two 1-2 gallon surge devices. I want to use a similar design to what is on this list...
http://209.151.83.92/forum/showthread.php?t=10325

The current idea is to flow from the DSB into the surge devices. Then let the surges flow back into the tank. The two surge devices would fill at different rates and create an irregular flow.

I am thinking of building a simple acrylic box split in two to save space and add to the simplicity. At this small size (3-4g) I think Home Depot acrylic will do the trick (Bill?).

More later,
Dave