Welp, am using the non Nauty BVC on my silver Subtank all this morning til now. Looks like the center tube/chimney may be a hair longer in the silver than the black one I originally tried it on because there is a separation between the bottom of the glass and the top of the base this time. HOWEVER, hasn't leaked at all.......Okay, just tried on the white and black Subtank using Bedazzle glass to be sure. No gap.