Compact Heater Recommendation for UNS 3N

[Kobin]

Hi I was looking for a compact heater with a low profile for a UNS 3N tank that I was going to repurpose into a small saltwater tank. It's currently an opae ula tank. Any recommendations?

 

[MoshJosh]

I have used these heaters and was fairly happy with them:

 

[Kobin]

Did you have any experience with it fluctuating a lot? I was eyeing a cobalt neotherm but I've had it fail on me in the past