Heater placement in plastic sump

[SpikeAZ]

I have a 35g rubbermaid sump and I was wondering what I can place the heater on so that it doesn't melt the plastic.

Or will it be ok if the suction cups lose suction and the heater is placed on the plastic?

TIA

 

[krap101]

thermometer=heater?

 

[SpikeAZ]

Whoops. Too much studying.
Thermometer = heater.

 

[Bearfan]

I've never had any problems suction cupping them to the bottom.