Going for my merit badge for beating an idea to death: 
This is the float valve I kinda had in mind:
http://www.automatedaquariums.com/lv_plc.htm
The idea being that a well placed hole drilled in the cypress and routed either at the very back (or through a bulk head) would provide ~1/2 accuracy.
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Greater Seattle Aquarium Society Member (GSAS.org)
Plant Auction February 12th, General Auction April 12th
Community 60 gal T8 +CO2 +sump.
Clown Barbs 75 gal T8 +sump
Goodeidae project 20Long PC
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