That is awful !! I am sorry I have two thoughts on solving that issue.
If you plugged in the aquarium heater into a rheostat perhaps you could control the max temp it could reach by limiting the power?
The second thought is I do not recall ever seeing a herpstat probe could not be used in water. It might be worth asking this question to Dion of spyder robotics (sales@spyderrobotics.com). Perhaps a herpstat intro could be used as a controller?
My third though is if the tank is glass could the probe of the hydrofarm be taped to the outside and be set like a fail safe to kick off below a critical temp inside is reached?
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