Where to place the probes

[FishieNut]

Silly question.
I want to place my probes and heater in my sump/fuge. I ahve a 30 gal three-part sump, with the middle the refugium.
Where do I put the probes; in the skimmer section, the refugium or the out to tank section? Same question for the heater(s), or should they go in the tank itself.

[samvanrl]

I have mine in the out (return) section

[FishieNut]

Sounds logical to me.

Thanks smavanrl.