Here's my design for the PicoFuge for my 29g biocube. It's the solution for having a refugium for any small tank!
:::Patent Pending:::
5"x5"x5"
Small powerhead resides in main tank. Pumps water to the PicoFuge through thin airline. Water comes in, flows through the cheato inside, and flows out the two holes in the bottom like a drain, back into the DT. Drains using gravity only as the PicoFuge will be placed anywhere above the aquarium. Two float switches are in place and are connected to the pump. Two, so that if one fails, the other hopefully won't. The float switches will help keep the water level constant.
***Not seen in rendering***
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Adjustable valve goes on each of the dual return pipes to allow for adjusting of out flow of water. This allows you to adjust for any pump to keep the amount of water coming in, equal to the amount flowing out. Therefore, the PicoFuge never overflows. Two return pipes make it easier to control the out flow rate.
Renderings:
Side View:
Top Down:
Comments??? Suggestions??? What do you think???