I have a 135g tank, it's only 18 inches wide, but I would like to scrape the black paint off the back and make it viewable from two sides. Problem with this is where can I put an overflow? Not through the bottom, the tank is glass so I'm fairly certain the bottom is tempered. I'm unsure if the sides are tempered, but if they are and I shatter it, how hard would it be to replace the glass (non-tempered) and then I could drill it right. My idea is to have an overflow just on one side, but I was thinking that might be an issue as far surface skimming (it is a 6 foot long tank) then I started think about making a long trough on either side of the tank maybe an inch below the lip really thin that goes back to the main overflow box so it does skim along the 6 foot length. Anyone have any ideas?