Premium Member
I don't like heaters in tanks but if it's unavoidable get it in an area with good flow. Close to a powerhead is your best bet.


Team RC
If you don't have the luxury of a sump, then place it on the back glass as close to the middle of the tank as you can.


In Memoriam
sump is the best place you want it in high flow area to keep a constant temp with out cold spots


In my 10G I have a titanium tube heater right below the tube intake into my HOB filter/refugium (it was too big to fit in the HOB). That way the "heated" water rises into/gets pulled into the intake and gets dispersed throughout the tank.

In my 20G, the heater tubes are in the refugium.


New member
Since it doesn't sound like you have a sump, behind your rock so it is hidden. You want your rock set away from your glass anyway for flow. Just make sure you have good flow on the heater.