As a new beginner, I fried fish once and don't want it happen again. Recently I saw a temperature controller which has mobile alert. Wondering should I buy a new heater or buy this temperature controller as 2nd protection.
https://blog.aquamutant.com/blog/mobile-alert-no-longer-fry-your-aquarium-fish/
https://blog.aquamutant.com/blog/mobile-alert-no-longer-fry-your-aquarium-fish/
