At Radio Shack they use to carry Window Alarm Tape for DIY home alarm installations. The tape would connect to sensors and get cut if the glass was broken. Just the fact that I 'know' what this is, is dating myself. Radio Shack may not have this anymore. There are lots of places that carry self-adhesive foil tape (copper or tinned is best since you can solder to it). If you can't find this tape, you can use thin metal strips of whatever. Just be sure that it's in full contact with the tank for best results. That's why tape works best.
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