big heaters are more prone to fail, I run four 100watt heaters in my 90g with a temp controller, if one fails I probably wouldn't know except my controller tells me the amps so I would know, if more than 1 fails then the temp might start to drop a bit but you would have time to troubleshoot, the odds of all 4 failing at the same time are pretty high.
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Crap happens, that's why they sell toilet paper in 48 roll packs!
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