Large fishes can easily knock and break your heater. Some fishes can get burns if they lie on the heater. So, how do you protect your heater from your fish, and how can you protect your fish from the heater?
There are two solutions. One is to purchaser a plastic-encased heater that’s ‘indestructible’. The other option is to purchase a fenestrated sleeve that goes over the glass encased submersible aquarium heater.
See pictures below:
