HCA: Hermit Crab Association

So I bought a new to me tank, missing a couple braces and it's old, but nearly half inch thick glass and it's still crystal clear, at 85 it was a steal . About 100 gallons I think. It's 60x20x20. That being said I need to heat it, and I would rather not have to use multiple ultratherms (though I will if necessary). So do any of you guys have experience with heat tape, flex watt or thg? I was thinking of using one of them to make a full sized heater. Any advice would be super helpful, as the forum search doesn't work all that well. Thanks in advance guys

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They make some pretty big heating pads! BeanFarm and ReptileBasics both make them about 11x47. DHPs are also one of the best hermit heaters, not quite as affordable as heat mats because of the dimming thermostat required, but worth it **if** you can afford it