My preference is running 2 heaters in the lower end of the spectrum. You can always have a back up in the storage.
My fear is over heating water issues. I have had this happen in my macro algae tank and it killed my enormous Mexican Turbo Snails and a few other things. Once on a different time, heater was stuck on high but because I used 2 lower Watt heaters (in one tank) it raised the tank temp but not to a deadly level.
There are heaters now with a trip fuse sort of thing, so if it sticks on high it shuts down at a certain temp.
Just Aquarium Advice as far I know.
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 New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
 Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves
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