Pro and Con of multiple heaters in one tank
"Multiple heaters:
Great safety net if one fails and shuts down
Useless if one fails and stays on "
The point is, one of them is far too weak to ever over heat your tank. Get it? If one is stuck on, the others will simply not turn on as often. The only problem with the multiple heater setup is you actually have to check the heaters from time to time to make sure they're functioning. You might not even know if one is stuck on or stuck off because the temperature of the tank might not fluctuate much.
Seems to me, an expensive controller is just back to having all of your eggs in one basket again. If the controller described above fails while you're away, then you have no heat control, no lights, no fans, etc. Right?
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