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Not normally - if the heater element is exposed to water, either the fuse in the heater itself (all such devices are UL certified) will break the circuit, or the house fuse/breaker will open.

However, malfunctioning heaters usually wind up either overheating or just going off, leaving it too cold for the fish, which will stress and make them sick. Always get a good quality heater, and one that's rated for the next size tank bigger than the one you're putting it in or you risk underheating the tank.

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16y ago

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