If anybody who's good at tank modification/construction could weight in here, it'd be much appreciated. I'm going to build something...but other than busting a lot of tanks trying to drill them for bulkheads, I have no experience in this area. Maybe I'll post another request for info in a couple of appropriate fora. I've also thought about learning to work with acrylic, as the glued used would probably make it easier to construct something like this...anybody worked with this stuff? Acrylic glue actually "welds" the pieces together, rather than silicone, which has a very weak bond to glass. The chemicals involved in acrylics are really nasty, though.