If you are considering the Sicce scuba contactless heater....

[corcorecorey]

These heaters won't run away and nuke your tank. They clearly are undersized anyways. They can't heat tanks it seems.

I don't know if I may have purchased one that's too large for my tank, but I'm having the opposite situation; my tank is getting too hot for my liking. It's currently at 87, and the red light on the heater is STILL on even thought I set it to 75 to try and offset the temp fluctuation.

 

[braaap]

I don't know if I may have purchased one that's too large for my tank, but I'm having the opposite situation; my tank is getting too hot for my liking. It's currently at 87, and the red light on the heater is STILL on even thought I set it to 75 to try and offset the temp fluctuation.

You’ve got it set wrong then.