Root Therm

[busdriver]

I've just installed a Root Therm undergravel heater in my 75 gal. tank.
It doesn't seem to affect the thermometer in the tank,
so how do I know it's working?
I stuck my finger in the water and didn't get any shock of any kind so it's not leaking electricity.

[Aquaviewer]

Take an extra thermometer and stick it down into the substrate.  It should read a temperature higher than your water.  If your water is over 80F you might not notice much of a difference.  Substrate heating works best if you can establish a temperature gradient with the substrate a few degrees warmer than the water to promote circulation.

[busdriver]

Thanks, Aquaviewer!

[Aquaviewer]

I forgot to ask.  Are you also running a heater in the tank?  The substrate heater won't heat to the tank on its own.

[busdriver]

Yes, I am.

[Aquaviewer]

Roger.