desaster hits....
Ouch! That has to be depressing. :(
When I was a kid, this was what got me out of aquariums. I had kept a healthy fresh water tank for years until one day I came home and everything had been killed by a heater stuck on.
From now on, I would only use multiple heaters. You should use 3 100W heaters instead of 1 300W. If one of the 3 gets stuck on, it won't be strong enough to cook the tank. If one breaks and won't come on, the tank shouldn't get too cold since there's still 200W of heating power.
It's more expensive, but it's good insurance.
Jack
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