[rdebonis]

I have read that it is advisable to use 2 heaters in tanks in fish rooms that get cold in the winter in case one fails, but your suggestion about using 2 at different positions in the tank to ensure the thermostats get more valid readings by averaging out the temperature makes sense.

I also like your suggestion about inverting the submersible heater to get the thermostat in the lower "cooler" water column for more accurate thermostatic readings.

I think combining both methods would make for a more constant temperature throughout the tank.

The only problem I have with this is that in large Community tanks you may find that different fish species like to stay at different temperature levels depending on their preference. Typically, catfish prefer the cooler water at the bottom of the tank and many top dwellers like slightly warmer water.

Thanks for the suggestions, they were very informative.