Planted Tank Obsessed
Join Date: Feb 2011
Location: Jackson TN, U.S.A.
I find this very interesting. Am I correct that the bottom edge is open to the tank, forming the air cavity, and that the indicator fluid is sitting on a kind of shelf made of slips of glass sandwiched between the front and back?
I don't think I'd want to try it myself with glass, though I understand why you went that route, but maybe acrylic .... must think on this.