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They are rated for 55-75 I believe I have about 70 gallons total. See I was thinking if one dies the other one will be able to maintain my tank. Not the way you just put it.
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Yeah hard to decide which way to go....If you have two small ones, and one dies then the other will be on all the time and the temp drop will be gradual and hopefully you'll pick up on it.
If you have two heaters rated for the size of the tank, and one fails "ON", then it will very quickly heat up your tank and cook it......
HTH's
cheers 
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NEVER get eye level with an infants anus!
New build, planning stages. 30 x 20 x 20", Geisemann Spectra 250W with Radium, Profilux controller, Profilux doser 2, Fluval SP4 return pump, Life Reef 28
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